I'm skeptical of the git bisect results:

$ git checkout cde5b485c9cdf0bfd5b6ea8e4973abe378270e60^
Previous HEAD position was cde5b48... fail instead of segfault on unreadable 
config files
HEAD is now at 235347e... Release 1.2.12
$ make fast
Compiling cachefile.cc to ../build/obj/apt-pkg/cachefile.opic
Compiling policy.cc to ../build/obj/apt-pkg/policy.opic
Building shared library ../build/bin/libapt-pkg.so.5.0.0
Compiling contrib/arfile.cc to ../build/obj/apt-inst/arfile.opic
Compiling contrib/extracttar.cc to ../build/obj/apt-inst/extracttar.opic
Compiling deb/debfile.cc to ../build/obj/apt-inst/debfile.opic
Compiling dirstream.cc to ../build/obj/apt-inst/dirstream.opic
Compiling extract.cc to ../build/obj/apt-inst/extract.opic
Compiling filelist.cc to ../build/obj/apt-inst/filelist.opic
Building shared library ../build/bin/libapt-inst.so.2.0.0
Compiling private-cacheset.cc to ../build/obj/apt-private/private-cacheset.opic
Compiling private-list.cc to ../build/obj/apt-private/private-list.opic
Compiling private-depends.cc to ../build/obj/apt-private/private-depends.opic
Compiling private-show.cc to ../build/obj/apt-private/private-show.opic
Building shared library ../build/bin/libapt-private.so.0.0.0
Compiling apt-mark.cc to ../build/obj/cmdline/apt-mark.o
Building program ../build/bin/apt-mark
Must have libdb to build apt-ftparchive
$ sudo rm -rf /var/lib/apt/lists
sarnold@hunt:~/trees/apt$ sudo LD_LIBRARY_PATH=$PWD/build/bin/ 
./build/bin/apt-get update -o Dir::Bin::Methods="$PWD/build/bin/methods/" 2>&1 
| tee update.log
Get:1 http://mirrors.kernel.org/ubuntu xenial InRelease [247 kB]
Get:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease [95.7 kB]
Get:3 http://security.debian.org jessie/updates InRelease [63.1 kB]
Get:4 http://mirrors.kernel.org/ubuntu xenial-security InRelease [94.5 kB]
Ign:5 http://mirrors.kernel.org/ubuntu precise InRelease
Get:6 http://mirrors.kernel.org/ubuntu precise-updates InRelease [55.7 kB]
Get:7 http://mirrors.kernel.org/ubuntu precise-security InRelease [55.7 kB]
Get:8 http://mirrors.kernel.org/ubuntu precise-proposed InRelease [55.7 kB]
Ign:9 http://mirrors.kernel.org/ubuntu trusty InRelease
Get:10 http://mirrors.kernel.org/ubuntu trusty-updates InRelease [65.9 kB]
Get:11 http://mirrors.kernel.org/ubuntu trusty-security InRelease [65.9 kB]
Get:12 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease [65.9 kB]
Get:13 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease [247 kB]
Get:14 http://mirrors.kernel.org/ubuntu yakkety InRelease [247 kB]
Get:15 http://security.debian.org wheezy/updates InRelease [40.6 kB]
Get:16 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease [94.5 kB]
Get:17 http://mirrors.kernel.org/ubuntu yakkety-security InRelease [93.3 kB]
Get:18 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease [95.7 kB]
Get:19 http://mirrors.kernel.org/ubuntu zesty InRelease [247 kB]
Ign:1 http://mirrors.kernel.org/ubuntu xenial InRelease
Get:20 http://mirrors.kernel.org/ubuntu zesty-updates InRelease [92.1 kB]
Get:21 http://mirrors.kernel.org/ubuntu zesty-security InRelease [92.2 kB]
Get:22 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease [95.6 kB]
Get:23 http://mirrors.kernel.org/ubuntu precise Release [49.6 kB]
Get:24 http://mirrors.kernel.org/ubuntu trusty Release [58.5 kB]
Get:25 http://mirrors.kernel.org/ubuntu xenial/main Sources [868 kB]
Get:26 http://security.ubuntu.com/ubuntu xenial-security InRelease [94.5 kB]
Get:27 http://mirrors.kernel.org/ubuntu xenial/restricted Sources [4,808 B]
Get:28 http://mirrors.kernel.org/ubuntu xenial/universe Sources [7,728 kB]
Ign:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease
Ign:4 http://mirrors.kernel.org/ubuntu xenial-security InRelease
Ign:29 http://archive.canonical.com/ubuntu precise InRelease
Get:30 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid 
InRelease [20.9 kB]
Get:31 http://ftp.debian.org/debian unstable InRelease [219 kB]
Get:32 http://mirrors.kernel.org/ubuntu xenial/multiverse Sources [179 kB]
Get:33 http://mirrors.kernel.org/ubuntu xenial/main amd64 Packages [1,201 kB]
Ign:6 http://mirrors.kernel.org/ubuntu precise-updates InRelease
Get:34 http://mirrors.kernel.org/ubuntu xenial/main i386 Packages [1,196 kB]
Get:35 http://mirrors.kernel.org/ubuntu xenial/main Translation-en [568 kB]
Get:36 http://mirrors.kernel.org/ubuntu xenial/restricted amd64 Packages [8,344 
B]
Get:37 http://mirrors.kernel.org/ubuntu xenial/restricted i386 Packages [8,684 
B]
Get:38 http://mirrors.kernel.org/ubuntu xenial/restricted Translation-en [2,908 
B]
Get:39 http://mirrors.kernel.org/ubuntu xenial/universe amd64 Packages [7,532 
kB]
Ign:7 http://mirrors.kernel.org/ubuntu precise-security InRelease
Ign:40 http://archive.canonical.com/ubuntu trusty InRelease
Ign:8 http://mirrors.kernel.org/ubuntu precise-proposed InRelease
Get:41 http://mirrors.kernel.org/ubuntu xenial/universe i386 Packages [7,512 kB]
Ign:10 http://mirrors.kernel.org/ubuntu trusty-updates InRelease
Get:42 http://archive.canonical.com/ubuntu xenial InRelease [11.5 kB]
Get:43 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease [16.0 
kB]
Ign:3 http://security.debian.org jessie/updates InRelease
Get:44 http://security.debian.org jessie/updates/main Sources [168 kB]
Get:45 http://mirrors.kernel.org/ubuntu xenial/universe Translation-en [4,354 
kB]
Ign:11 http://mirrors.kernel.org/ubuntu trusty-security InRelease
Get:46 http://security.debian.org jessie/updates/contrib Sources [1,439 B]
Get:47 http://mirrors.kernel.org/ubuntu xenial/multiverse amd64 Packages [144 
kB]
Get:48 http://mirrors.kernel.org/ubuntu xenial/multiverse i386 Packages [140 kB]
Get:49 http://archive.canonical.com/ubuntu yakkety InRelease [11.5 kB]
Get:50 http://mirrors.kernel.org/ubuntu xenial/multiverse Translation-en [106 
kB]
Ign:12 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease
Get:51 http://mirrors.kernel.org/ubuntu precise Release.gpg [198 B]
Get:52 http://mirrors.kernel.org/ubuntu trusty Release.gpg [933 B]
Get:53 http://mirrors.kernel.org/ubuntu xenial-updates/main Sources [203 kB]
Get:54 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease [23.9 kB]
Get:55 http://mirrors.kernel.org/ubuntu xenial-updates/restricted Sources 
[1,804 B]
Get:56 http://mirrors.kernel.org/ubuntu xenial-updates/universe Sources [109 kB]
Get:57 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse Sources 
[3,224 B]
Get:58 http://mirrors.kernel.org/ubuntu xenial-updates/main amd64 Packages [419 
kB]
Get:59 http://mirrors.kernel.org/ubuntu xenial-updates/main i386 Packages [414 
kB]
Get:60 http://mirrors.kernel.org/ubuntu xenial-updates/main Translation-en [161 
kB]
Get:61 http://mirrors.kernel.org/ubuntu xenial-updates/restricted amd64 
Packages [6,576 B]
Get:62 http://mirrors.kernel.org/ubuntu xenial-updates/restricted i386 Packages 
[6,528 B]
Get:63 http://mirrors.kernel.org/ubuntu xenial-updates/restricted 
Translation-en [2,016 B]
Get:64 http://mirrors.kernel.org/ubuntu xenial-updates/universe amd64 Packages 
[359 kB]
Get:65 http://mirrors.kernel.org/ubuntu xenial-updates/universe i386 Packages 
[355 kB]
Get:66 http://mirrors.kernel.org/ubuntu xenial-updates/universe Translation-en 
[130 kB]
Get:67 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse amd64 
Packages [7,048 B]
Get:68 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse i386 Packages 
[5,852 B]
Get:69 http://mirrors.kernel.org/ubuntu xenial-updates/multiverse 
Translation-en [2,868 B]
Get:70 http://mirrors.kernel.org/ubuntu xenial-security/main Sources [45.5 kB]
Get:71 http://mirrors.kernel.org/ubuntu xenial-security/restricted Sources 
[1,804 B]
Get:72 http://mirrors.kernel.org/ubuntu xenial-security/universe Sources [12.7 
kB]
Get:73 http://mirrors.kernel.org/ubuntu xenial-security/multiverse Sources [728 
B]
Get:74 http://mirrors.kernel.org/ubuntu xenial-security/main amd64 Packages 
[163 kB]
Get:75 http://mirrors.kernel.org/ubuntu xenial-security/main i386 Packages [159 
kB]
Get:76 http://mirrors.kernel.org/ubuntu xenial-security/main Translation-en 
[67.8 kB]
Get:77 http://mirrors.kernel.org/ubuntu xenial-security/restricted amd64 
Packages [6,576 B]
Get:78 http://mirrors.kernel.org/ubuntu xenial-security/restricted i386 
Packages [6,528 B]
Get:79 http://mirrors.kernel.org/ubuntu xenial-security/restricted 
Translation-en [2,016 B]
Get:80 http://mirrors.kernel.org/ubuntu xenial-security/universe amd64 Packages 
[52.8 kB]
Get:81 http://mirrors.kernel.org/ubuntu xenial-security/universe i386 Packages 
[52.7 kB]
Get:82 http://mirrors.kernel.org/ubuntu xenial-security/universe Translation-en 
[32.6 kB]
Get:83 http://mirrors.kernel.org/ubuntu xenial-security/multiverse amd64 
Packages [2,764 B]
Get:84 http://mirrors.kernel.org/ubuntu xenial-security/multiverse i386 
Packages [2,928 B]
Get:85 http://mirrors.kernel.org/ubuntu xenial-security/multiverse 
Translation-en [1,124 B]
Get:86 http://mirrors.kernel.org/ubuntu precise-updates/main Sources [499 kB]
Get:87 http://mirrors.kernel.org/ubuntu precise-updates/restricted Sources 
[8,840 B]
Get:88 http://mirrors.kernel.org/ubuntu precise-updates/universe Sources [132 
kB]
Get:89 http://mirrors.kernel.org/ubuntu precise-updates/multiverse Sources 
[10.5 kB]
Get:90 http://mirrors.kernel.org/ubuntu precise-security/main Sources [144 kB]
Get:91 http://mirrors.kernel.org/ubuntu precise-security/restricted Sources 
[4,623 B]
Get:92 http://mirrors.kernel.org/ubuntu precise-security/universe Sources [53.7 
kB]
Get:93 http://mirrors.kernel.org/ubuntu precise-security/multiverse Sources 
[3,044 B]
Get:94 http://mirrors.kernel.org/ubuntu precise-proposed/main Sources [6,747 B]
Get:95 http://mirrors.kernel.org/ubuntu precise-proposed/restricted Sources 
[774 B]
Get:96 http://mirrors.kernel.org/ubuntu trusty-updates/main Sources [384 kB]
Ign:13 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease
Get:97 http://mirrors.kernel.org/ubuntu trusty-updates/restricted Sources 
[5,888 B]
Get:98 http://mirrors.kernel.org/ubuntu trusty-updates/universe Sources [169 kB]
Get:99 http://mirrors.kernel.org/ubuntu trusty-updates/multiverse Sources 
[7,522 B]
Get:100 http://mirrors.kernel.org/ubuntu trusty-security/main Sources [120 kB]
Get:101 http://mirrors.kernel.org/ubuntu trusty-security/restricted Sources 
[4,613 B]
Get:102 http://mirrors.kernel.org/ubuntu trusty-security/universe Sources [45.1 
kB]
Get:103 http://mirrors.kernel.org/ubuntu trusty-security/multiverse Sources 
[3,207 B]
Get:104 http://mirrors.kernel.org/ubuntu trusty-proposed/main Sources [122 kB]
Get:105 http://mirrors.kernel.org/ubuntu trusty-proposed/universe Sources [16.6 
kB]
Get:106 http://mirrors.kernel.org/ubuntu xenial-proposed/main Sources [90.6 kB]
Get:107 http://mirrors.kernel.org/ubuntu xenial-proposed/universe Sources [35.2 
kB]
Get:108 http://mirrors.kernel.org/ubuntu xenial-proposed/multiverse Sources 
[900 B]
Get:109 http://archive.canonical.com/ubuntu zesty InRelease [11.4 kB]
Ign:15 http://security.debian.org wheezy/updates InRelease
Get:110 http://security.debian.org wheezy/updates/main Sources [293 kB]
Get:111 http://archive.canonical.com/ubuntu precise Release [8,180 B]
Ign:14 http://mirrors.kernel.org/ubuntu yakkety InRelease
Get:112 http://mirrors.kernel.org/ubuntu yakkety/main Sources [903 kB]
Get:113 http://mirrors.kernel.org/ubuntu yakkety/restricted Sources [5,376 B]
Get:114 http://mirrors.kernel.org/ubuntu yakkety/universe Sources [8,044 kB]
Ign:16 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease
Get:115 http://archive.canonical.com/ubuntu trusty Release [9,359 B]
Ign:17 http://mirrors.kernel.org/ubuntu yakkety-security InRelease
Get:116 http://ftp.debian.org/debian testing InRelease [172 kB]
Get:117 http://mirrors.kernel.org/ubuntu yakkety/multiverse Sources [181 kB]
Get:118 http://mirrors.kernel.org/ubuntu yakkety-updates/main Sources [27.3 kB]
Get:119 http://mirrors.kernel.org/ubuntu yakkety-updates/universe Sources [11.4 
kB]
Get:120 http://mirrors.kernel.org/ubuntu yakkety-updates/multiverse Sources 
[724 B]
Ign:18 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease
Get:121 http://mirrors.kernel.org/ubuntu yakkety-security/main Sources [13.7 kB]
Get:122 http://mirrors.kernel.org/ubuntu yakkety-security/universe Sources 
[3,404 B]
Get:123 http://archive.canonical.com/ubuntu precise Release.gpg [198 B]
Get:124 http://mirrors.kernel.org/ubuntu yakkety-security/multiverse Sources 
[724 B]
Get:125 http://mirrors.kernel.org/ubuntu yakkety-proposed/main Sources [21.4 kB]
Get:126 http://mirrors.kernel.org/ubuntu yakkety-proposed/universe Sources 
[8,324 B]
Ign:19 http://mirrors.kernel.org/ubuntu zesty InRelease
Get:127 http://mirrors.kernel.org/ubuntu zesty/main Sources [909 kB]
Get:128 http://mirrors.kernel.org/ubuntu zesty/restricted Sources [5,380 B]
Get:129 http://mirrors.kernel.org/ubuntu zesty/universe Sources [8,248 kB]
Ign:20 http://mirrors.kernel.org/ubuntu zesty-updates InRelease
Get:130 http://archive.canonical.com/ubuntu trusty Release.gpg [933 B]
Ign:21 http://mirrors.kernel.org/ubuntu zesty-security InRelease
Ign:22 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease
Get:131 http://mirrors.kernel.org/ubuntu zesty/multiverse Sources [185 kB]
Get:132 http://mirrors.kernel.org/ubuntu zesty-proposed/main Sources [44.9 kB]
Get:133 http://mirrors.kernel.org/ubuntu zesty-proposed/universe Sources [317 
kB]
Get:134 http://mirrors.kernel.org/ubuntu zesty-proposed/multiverse Sources 
[6,136 B]
Ign:26 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:30 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid 
InRelease
Get:135 http://security.ubuntu.com/ubuntu xenial-security/main Sources [45.5 kB]
Ign:42 http://archive.canonical.com/ubuntu xenial InRelease
Ign:43 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease
Ign:136 http://ftp.debian.org/debian jessie InRelease
Get:137 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
vivid/main Sources [110 kB]
Get:138 http://security.ubuntu.com/ubuntu xenial-security/restricted Sources 
[1,804 B]
Get:139 http://security.ubuntu.com/ubuntu xenial-security/universe Sources 
[12.7 kB]
Get:140 http://security.ubuntu.com/ubuntu xenial-security/multiverse Sources 
[728 B]
Get:141 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages 
[163 kB]
Ign:49 http://archive.canonical.com/ubuntu yakkety InRelease
Get:142 http://archive.canonical.com/ubuntu xenial/partner Sources [2,236 B]
Get:143 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages 
[159 kB]
Ign:51 http://mirrors.kernel.org/ubuntu precise Release.gpg
Get:144 http://mirrors.kernel.org/ubuntu precise/main Sources [934 kB]
Get:145 http://ftp.debian.org/debian jessie-updates InRelease [145 kB]
Get:146 http://mirrors.kernel.org/ubuntu precise/restricted Sources [5,470 B]
Get:147 http://mirrors.kernel.org/ubuntu precise/universe Sources [5,019 kB]
Get:148 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en 
[67.8 kB]
Get:149 http://archive.canonical.com/ubuntu yakkety/partner Sources [2,252 B]
Ign:52 http://mirrors.kernel.org/ubuntu trusty Release.gpg
Get:150 http://mirrors.kernel.org/ubuntu precise/multiverse Sources [155 kB]
Get:151 http://mirrors.kernel.org/ubuntu trusty/main Sources [1,064 kB]
Get:152 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 
Packages [6,576 B]
Get:153 http://security.ubuntu.com/ubuntu xenial-security/restricted i386 
Packages [6,528 B]
Get:154 http://security.ubuntu.com/ubuntu xenial-security/restricted 
Translation-en [2,016 B]
Get:155 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 
Packages [52.8 kB]
Get:156 http://security.ubuntu.com/ubuntu xenial-security/universe i386 
Packages [52.7 kB]
Get:157 http://security.ubuntu.com/ubuntu xenial-security/universe 
Translation-en [32.6 kB]
Get:158 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 
Packages [2,764 B]
Get:159 http://security.ubuntu.com/ubuntu xenial-security/multiverse i386 
Packages [2,928 B]
Get:160 http://mirrors.kernel.org/ubuntu trusty/restricted Sources [5,433 B]
Get:161 http://mirrors.kernel.org/ubuntu trusty/universe Sources [6,399 kB]
Ign:162 http://ftp.debian.org/debian wheezy InRelease
Get:163 http://security.ubuntu.com/ubuntu xenial-security/multiverse 
Translation-en [1,124 B]
Ign:109 http://archive.canonical.com/ubuntu zesty InRelease
Ign:54 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease
Get:164 http://mirrors.kernel.org/ubuntu trusty/multiverse Sources [174 kB]
Get:165 http://ftp.debian.org/debian wheezy-updates InRelease [157 kB]
Ign:31 http://ftp.debian.org/debian unstable InRelease
Get:166 http://archive.canonical.com/ubuntu zesty/partner Sources [1,772 B]
Ign:123 http://archive.canonical.com/ubuntu precise Release.gpg
Ign:130 http://archive.canonical.com/ubuntu trusty Release.gpg
Get:167 http://ftp.debian.org/debian jessie Release [148 kB]
Ign:116 http://ftp.debian.org/debian testing InRelease
Get:168 http://archive.canonical.com/ubuntu precise/partner Sources [5,733 B]
Ign:145 http://ftp.debian.org/debian jessie-updates InRelease
Ign:165 http://ftp.debian.org/debian wheezy-updates InRelease
Get:169 http://ftp.debian.org/debian wheezy Release [191 kB]
Get:170 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid/main Sources 
[13.3 kB]
Get:171 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial/main Sources [92.0 kB]
Get:172 http://archive.canonical.com/ubuntu trusty/partner Sources [10.0 kB]
Get:173 http://ftp.debian.org/debian unstable/main Sources [7,214 kB]
Get:174 http://ftp.debian.org/debian unstable/non-free Sources [85.4 kB]
Get:175 http://ftp.debian.org/debian jessie Release.gpg [2,373 B]
Ign:175 http://ftp.debian.org/debian jessie Release.gpg
Get:176 http://ftp.debian.org/debian testing/main Sources [6,571 kB]
Get:177 http://ftp.debian.org/debian testing/non-free Sources [80.2 kB]
Get:178 http://ftp.debian.org/debian jessie-updates/main Sources [15.4 kB]
Get:179 http://ftp.debian.org/debian jessie-updates/non-free Sources [920 B]
Get:180 http://ftp.debian.org/debian wheezy-updates/main Sources [5,505 B]
Get:181 http://ftp.debian.org/debian wheezy-updates/non-free Sources [929 B]
Get:182 http://ftp.debian.org/debian wheezy Release.gpg [2,373 B]
Ign:182 http://ftp.debian.org/debian wheezy Release.gpg
Get:183 http://ftp.debian.org/debian jessie/main Sources [7,059 kB]
Get:184 http://ftp.debian.org/debian jessie/contrib Sources [50.8 kB]
Get:185 http://ftp.debian.org/debian jessie/non-free Sources [99.0 kB]
Get:186 http://ftp.debian.org/debian wheezy/main Sources [5,993 kB]
Get:187 http://ftp.debian.org/debian wheezy/contrib Sources [47.7 kB]
Get:188 http://ftp.debian.org/debian wheezy/non-free Sources [93.4 kB]
Fetched 101 MB in 13s (7,337 kB/s)
Reading package lists...
W: GPG error: http://mirrors.kernel.org/ubuntu xenial InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial InRelease' is not 
signed.
W: GPG error: http://mirrors.kernel.org/ubuntu xenial-updates InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial-updates InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu xenial-security InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial-security InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu precise-updates InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise-updates InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu precise-security InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise-security InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu precise-proposed InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise-proposed InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty-updates InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty-updates InRelease' 
is not signed.
W: GPG error: http://security.debian.org jessie/updates InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://security.debian.org jessie/updates InRelease' is not 
signed.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty-security InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty-security InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty-proposed InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty-proposed InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu xenial-proposed InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu xenial-proposed InRelease' 
is not signed.
W: GPG error: http://security.debian.org wheezy/updates InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://security.debian.org wheezy/updates InRelease' is not 
signed.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety InRelease' is not 
signed.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety-updates InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety-updates InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety-security InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety-security InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty InRelease' is not 
signed.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty-updates InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty-updates InRelease' is 
not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty-security InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty-security InRelease' 
is not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu zesty-proposed InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu zesty-proposed InRelease' 
is not signed.
W: GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: At 
least one invalid signature was encountered.
W: The repository 'http://security.ubuntu.com/ubuntu xenial-security InRelease' 
is not signed.
W: GPG error: 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid 
InRelease: At least one invalid signature was encountered.
W: The repository 
'http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
vivid InRelease' is not signed.
W: GPG error: http://archive.canonical.com/ubuntu xenial InRelease: At least 
one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu xenial InRelease' is not 
signed.
W: GPG error: http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease: 
At least one invalid signature was encountered.
W: The repository 'http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid 
InRelease' is not signed.
W: GPG error: http://archive.canonical.com/ubuntu yakkety InRelease: At least 
one invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu yakkety InRelease' is 
not signed.
W: GPG error: http://mirrors.kernel.org/ubuntu precise Release: At least one 
invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu precise Release' is not 
signed.
W: GPG error: http://mirrors.kernel.org/ubuntu trusty Release: At least one 
invalid signature was encountered.
W: The repository 'http://mirrors.kernel.org/ubuntu trusty Release' is not 
signed.
W: GPG error: http://archive.canonical.com/ubuntu zesty InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu zesty InRelease' is not 
signed.
W: GPG error: 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease: At least one invalid signature was encountered.
W: The repository 
'http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease' is not signed.
W: GPG error: http://ftp.debian.org/debian unstable InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian unstable InRelease' is not 
signed.
W: GPG error: http://archive.canonical.com/ubuntu precise Release: At least one 
invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu precise Release' is not 
signed.
W: GPG error: http://archive.canonical.com/ubuntu trusty Release: At least one 
invalid signature was encountered.
W: The repository 'http://archive.canonical.com/ubuntu trusty Release' is not 
signed.
W: GPG error: http://ftp.debian.org/debian testing InRelease: At least one 
invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian testing InRelease' is not 
signed.
W: GPG error: http://ftp.debian.org/debian jessie-updates InRelease: At least 
one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian jessie-updates InRelease' is 
not signed.
W: GPG error: http://ftp.debian.org/debian wheezy-updates InRelease: At least 
one invalid signature was encountered.
W: The repository 'http://ftp.debian.org/debian wheezy-updates InRelease' is 
not signed.
W: GPG error: http://ftp.debian.org/debian jessie Release: At least one invalid 
signature was encountered.
W: The repository 'http://ftp.debian.org/debian jessie Release' is not signed.
W: GPG error: http://ftp.debian.org/debian wheezy Release: At least one invalid 
signature was encountered.
W: The repository 'http://ftp.debian.org/debian wheezy Release' is not signed.


** Changed in: apt (Ubuntu)
       Status: Incomplete => New

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/1642386

Title:
  At least one invalid signature was encountered.

Status in apt package in Ubuntu:
  New

Bug description:
  Hello, a recent apt update appears to have broken apt entirely.

  A coworker reported seeing troubles: http://paste.ubuntu.com/23487135/

  To test, I upgraded my laptop then immediately re-ran apt-get update
  && apt-get -u dist-upgrade:

  sarnold@hunt:~/Downloads$ sudo apt-get update && sudo apt-get -u dist-upgrade
  Hit:1 http://mirrors.kernel.org/ubuntu xenial InRelease
  Hit:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease               
                                    
  Hit:3 http://mirrors.kernel.org/ubuntu xenial-security InRelease              
                                    
  Ign:4 http://mirrors.kernel.org/ubuntu precise InRelease                      
                                    
  Get:5 http://mirrors.kernel.org/ubuntu precise-updates InRelease [55.7 kB]    
                                    
  Get:6 http://mirrors.kernel.org/ubuntu precise-security InRelease [55.7 kB]   
                                    
  Get:7 http://mirrors.kernel.org/ubuntu precise-proposed InRelease [55.7 kB]   
                                    
  Ign:8 http://mirrors.kernel.org/ubuntu trusty InRelease                       
                                    
  Get:9 http://mirrors.kernel.org/ubuntu trusty-updates InRelease [65.9 kB]     
                                    
  Hit:10 http://mirrors.kernel.org/ubuntu trusty-security InRelease             
                                    
  Get:11 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease [65.9 kB]   
                                    
  Get:12 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease [247 kB]    
                                    
  Err:1 http://mirrors.kernel.org/ubuntu xenial InRelease                       
                                    
    At least one invalid signature was encountered.
  Hit:13 http://security.debian.org jessie/updates InRelease                    
                                    
  Err:2 http://mirrors.kernel.org/ubuntu xenial-updates InRelease               
                                    
    At least one invalid signature was encountered.
  Get:14 http://mirrors.kernel.org/ubuntu yakkety InRelease [247 kB]            
                                    
  Err:3 http://mirrors.kernel.org/ubuntu xenial-security InRelease              
                                    
    At least one invalid signature was encountered.
  Hit:15 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease             
                                    
  Get:16 http://mirrors.kernel.org/ubuntu yakkety-security InRelease [93.3 kB]  
                                    
  Hit:17 http://security.debian.org wheezy/updates InRelease                    
                                    
  Get:18 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease [95.7 kB]  
                                    
  Hit:19 http://mirrors.kernel.org/ubuntu zesty InRelease                       
                                    
  Hit:20 http://mirrors.kernel.org/ubuntu zesty-updates InRelease               
                                    
  Hit:21 http://mirrors.kernel.org/ubuntu zesty-security InRelease              
                                    
  Err:5 http://mirrors.kernel.org/ubuntu precise-updates InRelease              
                                    
    At least one invalid signature was encountered.
  Hit:22 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease              
                                    
  Hit:23 http://mirrors.kernel.org/ubuntu precise Release                       
                                    
  Hit:24 http://mirrors.kernel.org/ubuntu trusty Release                        
                                    
  Ign:25 http://archive.canonical.com/ubuntu precise InRelease                  
                                    
  Hit:26 http://security.ubuntu.com/ubuntu xenial-security InRelease            
                                    
  Hit:27 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid 
InRelease
  Hit:28 http://ftp.debian.org/debian unstable InRelease                        
                 
  Err:6 http://mirrors.kernel.org/ubuntu precise-security InRelease        
    At least one invalid signature was encountered.
  Err:7 http://mirrors.kernel.org/ubuntu precise-proposed InRelease             
                 
    At least one invalid signature was encountered.
  Err:9 http://mirrors.kernel.org/ubuntu trusty-updates InRelease               
                 
    At least one invalid signature was encountered.
  Ign:29 http://archive.canonical.com/ubuntu trusty InRelease                   
                  
  Hit:30 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease       
                  
  Hit:31 http://ftp.debian.org/debian testing InRelease                     
  Err:10 http://mirrors.kernel.org/ubuntu trusty-security InRelease         
    At least one invalid signature was encountered.
  Err:11 http://mirrors.kernel.org/ubuntu trusty-proposed InRelease             
                  
    At least one invalid signature was encountered.
  Err:13 http://security.debian.org jessie/updates InRelease                    
                  
    At least one invalid signature was encountered.
  Hit:32 http://archive.canonical.com/ubuntu xenial InRelease                   
                  
  Hit:33 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease
  Ign:34 http://ftp.debian.org/debian jessie InRelease                     
  Err:12 http://mirrors.kernel.org/ubuntu xenial-proposed InRelease        
    At least one invalid signature was encountered.
  Err:14 http://mirrors.kernel.org/ubuntu yakkety InRelease                
    At least one invalid signature was encountered.
  Hit:35 http://archive.canonical.com/ubuntu yakkety InRelease              
  Err:15 http://mirrors.kernel.org/ubuntu yakkety-updates InRelease         
    At least one invalid signature was encountered.
  Hit:36 http://ftp.debian.org/debian jessie-updates InRelease              
  Err:16 http://mirrors.kernel.org/ubuntu yakkety-security InRelease        
    At least one invalid signature was encountered.
  Err:17 http://security.debian.org wheezy/updates InRelease                
    At least one invalid signature was encountered.
  Hit:37 http://archive.canonical.com/ubuntu zesty InRelease                
  Err:18 http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease        
    At least one invalid signature was encountered.
  Ign:38 http://ftp.debian.org/debian wheezy InRelease                     
  Err:19 http://mirrors.kernel.org/ubuntu zesty InRelease                  
    At least one invalid signature was encountered.
  Err:20 http://mirrors.kernel.org/ubuntu zesty-updates InRelease           
    At least one invalid signature was encountered.
  Hit:39 http://archive.canonical.com/ubuntu precise Release                
  Err:21 http://mirrors.kernel.org/ubuntu zesty-security InRelease          
    At least one invalid signature was encountered.
  Hit:40 http://ftp.debian.org/debian wheezy-updates InRelease              
  Err:22 http://mirrors.kernel.org/ubuntu zesty-proposed InRelease          
    At least one invalid signature was encountered.
  Err:41 http://mirrors.kernel.org/ubuntu precise Release.gpg               
    At least one invalid signature was encountered.
  Hit:42 http://archive.canonical.com/ubuntu trusty Release                
  Err:43 http://mirrors.kernel.org/ubuntu trusty Release.gpg               
    At least one invalid signature was encountered.
  Hit:44 http://ftp.debian.org/debian jessie Release  
  Err:26 http://security.ubuntu.com/ubuntu xenial-security InRelease
    At least one invalid signature was encountered.
  Err:27 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid 
InRelease
    At least one invalid signature was encountered.
  Err:28 http://ftp.debian.org/debian unstable InRelease
    At least one invalid signature was encountered.
  Hit:45 http://ftp.debian.org/debian wheezy Release  
  Err:30 http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease
    At least one invalid signature was encountered.
  Err:31 http://ftp.debian.org/debian testing InRelease
    At least one invalid signature was encountered.
  Err:32 http://archive.canonical.com/ubuntu xenial InRelease
    At least one invalid signature was encountered.
  Err:33 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease
    At least one invalid signature was encountered.
  Err:35 http://archive.canonical.com/ubuntu yakkety InRelease
    At least one invalid signature was encountered.
  Err:36 http://ftp.debian.org/debian jessie-updates InRelease
    At least one invalid signature was encountered.
  Err:37 http://archive.canonical.com/ubuntu zesty InRelease
    At least one invalid signature was encountered.
  Err:46 http://archive.canonical.com/ubuntu precise Release.gpg
    At least one invalid signature was encountered.
  Err:40 http://ftp.debian.org/debian wheezy-updates InRelease
    At least one invalid signature was encountered.
  Err:47 http://archive.canonical.com/ubuntu trusty Release.gpg
    At least one invalid signature was encountered.
  Err:48 http://ftp.debian.org/debian jessie Release.gpg
    At least one invalid signature was encountered.
  Err:49 http://ftp.debian.org/debian wheezy Release.gpg
    At least one invalid signature was encountered.
  Fetched 981 kB in 1s (496 kB/s)
  Reading package lists... Done
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu xenial InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu xenial-updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu xenial-security InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu precise-updates InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu precise-security InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu precise-proposed InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu trusty-updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu trusty-security InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu trusty-proposed InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://security.debian.org jessie/updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu xenial-proposed InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu yakkety InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu yakkety-updates InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu yakkety-security InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://security.debian.org wheezy/updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu yakkety-proposed InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu zesty InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu zesty-updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu zesty-security InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu zesty-proposed InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu precise Release: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://mirrors.kernel.org/ubuntu trusty Release: At least one invalid signature 
was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://security.ubuntu.com/ubuntu xenial-security InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu vivid 
InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ftp.debian.org/debian unstable InRelease: At least one invalid signature 
was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ppa.launchpad.net/snappy-dev/image/ubuntu vivid InRelease: At least one 
invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ftp.debian.org/debian testing InRelease: At least one invalid signature 
was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://archive.canonical.com/ubuntu xenial InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu 
xenial InRelease: At least one invalid signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://archive.canonical.com/ubuntu yakkety InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ftp.debian.org/debian jessie-updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://archive.canonical.com/ubuntu zesty InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://archive.canonical.com/ubuntu precise Release: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ftp.debian.org/debian wheezy-updates InRelease: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://archive.canonical.com/ubuntu trusty Release: At least one invalid 
signature was encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ftp.debian.org/debian jessie Release: At least one invalid signature was 
encountered.
  W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://ftp.debian.org/debian wheezy Release: At least one invalid signature was 
encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/xenial/InRelease  
At least one invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/xenial-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/xenial-security/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://security.ubuntu.com/ubuntu/dists/xenial-security/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu/dists/vivid/InRelease
  At least one invalid signature was encountered.
  W: Failed to fetch 
http://ppa.launchpad.net/snappy-dev/image/ubuntu/dists/vivid/InRelease  At 
least one invalid signature was encountered.
  W: Failed to fetch 
http://ppa.launchpad.net/ci-train-ppa-service/stable-phone-overlay/ubuntu/dists/xenial/InRelease
  At least one invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/precise-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/precise-security/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/precise-proposed/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/trusty-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/trusty-security/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/trusty-proposed/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/xenial-proposed/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/xenial/InRelease 
 At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/yakkety/InRelease  
At least one invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/yakkety-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/yakkety-security/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/yakkety-proposed/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://archive.canonical.com/ubuntu/dists/yakkety/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/zesty/InRelease  At 
least one invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/zesty-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/zesty-security/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://mirrors.kernel.org/ubuntu/dists/zesty-proposed/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch http://archive.canonical.com/ubuntu/dists/zesty/InRelease  
At least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/unstable/InRelease  At 
least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/testing/InRelease  At 
least one invalid signature was encountered.
  W: Failed to fetch 
http://ftp.debian.org/debian/dists/jessie-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch http://security.debian.org/dists/jessie/updates/InRelease  
At least one invalid signature was encountered.
  W: Failed to fetch 
http://ftp.debian.org/debian/dists/wheezy-updates/InRelease  At least one 
invalid signature was encountered.
  W: Failed to fetch http://security.debian.org/dists/wheezy/updates/InRelease  
At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/precise/Release.gpg 
 At least one invalid signature was encountered.
  W: Failed to fetch http://mirrors.kernel.org/ubuntu/dists/trusty/Release.gpg  
At least one invalid signature was encountered.
  W: Failed to fetch 
http://archive.canonical.com/ubuntu/dists/precise/Release.gpg  At least one 
invalid signature was encountered.
  W: Failed to fetch 
http://archive.canonical.com/ubuntu/dists/trusty/Release.gpg  At least one 
invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/jessie/Release.gpg  At 
least one invalid signature was encountered.
  W: Failed to fetch http://ftp.debian.org/debian/dists/wheezy/Release.gpg  At 
least one invalid signature was encountered.
  W: Some index files failed to download. They have been ignored, or old ones 
used instead.
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  The following packages were automatically installed and are no longer 
required:
    linux-headers-4.4.0-21 linux-headers-4.4.0-21-generic 
linux-headers-4.4.0-22 linux-headers-4.4.0-22-generic
    linux-headers-4.4.0-24 linux-headers-4.4.0-24-generic 
linux-headers-4.4.0-28 linux-headers-4.4.0-28-generic
    linux-headers-4.4.0-31 linux-headers-4.4.0-31-generic 
linux-headers-4.4.0-34 linux-headers-4.4.0-34-generic
    linux-headers-4.4.0-36 linux-headers-4.4.0-36-generic 
linux-headers-4.4.0-38 linux-headers-4.4.0-38-generic
    linux-image-4.4.0-21-generic linux-image-4.4.0-22-generic 
linux-image-4.4.0-24-generic
    linux-image-4.4.0-28-generic linux-image-4.4.0-31-generic 
linux-image-4.4.0-34-generic
    linux-image-4.4.0-36-generic linux-image-4.4.0-38-generic
  Use 'sudo apt autoremove' to remove them.
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


  I'll attach the full terminal log soon.

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: apt 1.2.15
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Nov 16 12:29:54 2016
  InstallationDate: Installed on 2012-10-18 (1490 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120823.1)
  SourcePackage: apt
  UpgradeStatus: Upgraded to xenial on 2016-04-30 (200 days ago)

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