Public bug reported:

I have found that when there are new packages available which my machine
doesn't know about yet, if I run "sudo apt-get update" this is the
output:

    Get:1 http://gb.archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
    Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
    Get:3 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease [82.2 kB]
    Get:4 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages 
[28 B]
    Get:5 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease [82.2 
kB]
    Get:6 http://security.ubuntu.com/ubuntu xenial-security/restricted i386 
Packages [28 B]
    Get:7 http://security.ubuntu.com/ubuntu xenial-security/universe i386 
Packages [28 B]
    Get:8 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 
Packages [28 B]
    Get:9 http://security.ubuntu.com/ubuntu xenial-security/multiverse i386 
Packages [28 B]
    Get:10 http://security.ubuntu.com/ubuntu xenial-security/multiverse 
Translation-en [28 B]
    Get:11 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 
[1,201 kB]
    Get:12 http://gb.archive.ubuntu.com/ubuntu xenial/main i386 Packages [1,196 
kB]
    Get:13 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en_GB 
[426 kB]
    Get:14 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en [568 
kB]
    Get:15 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 DEP-11 
Metadata [733 kB]
    Get:16 http://gb.archive.ubuntu.com/ubuntu xenial/main DEP-11 64x64 Icons 
[409 kB]
    Get:17 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages 
[8,344 B]
    Get:18 http://gb.archive.ubuntu.com/ubuntu xenial/restricted i386 Packages 
[8,684 B]
    Get:19 http://gb.archive.ubuntu.com/ubuntu xenial/restricted 
Translation-en_GB [2,556 B]
    Get:20 http://gb.archive.ubuntu.com/ubuntu xenial/restricted Translation-en 
[2,908 B]
    Get:21 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 DEP-11 
Metadata [186 B]
    Get:22 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 
[7,532 kB]
    Get:23 http://gb.archive.ubuntu.com/ubuntu xenial/universe i386 Packages 
[7,512 kB]
    Get:24 http://gb.archive.ubuntu.com/ubuntu xenial/universe 
Translation-en_GB [3,040 kB]
    Get:25 http://gb.archive.ubuntu.com/ubuntu xenial/universe Translation-en 
[4,354 kB]
    Get:26 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 DEP-11 
Metadata [3,410 kB]
    Get:27 http://gb.archive.ubuntu.com/ubuntu xenial/universe DEP-11 64x64 
Icons [7,448 kB]
    Get:28 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages 
[144 kB]
    Get:29 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse i386 Packages 
[140 kB]
    Get:30 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse 
Translation-en_GB [88.1 kB]
    Get:31 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse Translation-en 
[106 kB]
    Get:32 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 DEP-11 
Metadata [63.8 kB]
    Get:33 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse DEP-11 64x64 
Icons [230 kB]
    Get:34 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages [28 B]
    Get:35 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main i386 
Packages [28 B]
    Get:36 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main 
Translation-en [28 B]
    Get:37 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 
Packages [28 B]
    Get:38 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted i386 
Packages [28 B]
    Get:39 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted 
Translation-en [28 B]
    Get:40 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 
Packages [28 B]
    Get:41 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe i386 
Packages [28 B]
    Get:42 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe 
Translation-en [28 B]
    Get:43 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 
Packages [28 B]
    Get:44 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse i386 
Packages [28 B]
    Get:45 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse 
Translation-en [28 B]
    Get:46 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main amd64 
Packages [28 B]
    Get:47 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main i386 
Packages [28 B]
    Get:48 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main 
Translation-en [28 B]
    Get:49 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
amd64 Packages [28 B]
    Get:50 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted i386 
Packages [28 B]
    Get:51 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
Translation-en [28 B]
    Get:52 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 
Packages [28 B]
    Get:53 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe i386 
Packages [28 B]
    Get:54 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe 
Translation-en [28 B]
    Get:55 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
amd64 Packages [28 B]
    Get:56 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse i386 
Packages [28 B]
    Get:57 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
Translation-en [28 B]
    Fetched 39.0 MB in 7min 59s (81.3 kB/s)
    AppStream cache update completed, but some metadata was ignored due to 
errors.
    Reading package lists... Done

And when running "sudo appstreamcli refresh --force --verbose" the
output is as follows:

    ** (appstreamcli:2227): DEBUG: Refreshing AppStream cache
    ** (appstreamcli:2227): DEBUG: Reading: 
/usr/share/app-info/xmls/org.freedesktop.fwupd.xml
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_restricted_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_main_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_Components-amd64.yml.gz
    ** (appstreamcli:2227): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: plan.desktop was 
already added with the same priority.
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: flcheckers.desktop 
was already added with the same priority.
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: flblocks.desktop was 
already added with the same priority.
    ** (appstreamcli:2227): DEBUG: Detected colliding ids: flsudoku.desktop was 
already added with the same priority.
    ** (appstreamcli:2227): DEBUG: zathura-pdf-poppler.desktop extends 
zathura.desktop, but zathura.desktop was not found.
    ** (appstreamcli:2227): DEBUG: WARNING: Skipped component 
'com.steelseries.rival-legacy.firmware': The component is invalid.
    ** (appstreamcli:2227): DEBUG: Removing old rebuild-dir from previous 
database rebuild.
    AppStream cache update completed, but some metadata was ignored due to 
errors.

I have found this to be present on all Ubuntu 16.04 flavours which I
have tried, I have also been informed that this is likely to be a
server-side issue. You can also see from this
https://askubuntu.com/q/761884/364819 that many are experiencing it.

** Affects: appstream
     Importance: Unknown
         Status: Unknown

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New

** Affects: appstream (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xenial

** Bug watch added: Debian Bug tracker #820774
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820774

** Also affects: appstream via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=820774
   Importance: Unknown
       Status: Unknown

** Also affects: ubuntu-gnome
   Importance: Undecided
       Status: New

** Description changed:

  I have found that when there are new packages available which my machine
  doesn't know about yet, if I run "sudo apt-get update" this is the
  output:
  
-     Get:1 http://gb.archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
-     Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
-     Get:3 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease [82.2 
kB]
-     Get:4 http://security.ubuntu.com/ubuntu xenial-security/main i386 
Packages [28 B]
-     Get:5 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease 
[82.2 kB]
-     Get:6 http://security.ubuntu.com/ubuntu xenial-security/restricted i386 
Packages [28 B]
-     Get:7 http://security.ubuntu.com/ubuntu xenial-security/universe i386 
Packages [28 B]
-     Get:8 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 
Packages [28 B]
-     Get:9 http://security.ubuntu.com/ubuntu xenial-security/multiverse i386 
Packages [28 B]
-     Get:10 http://security.ubuntu.com/ubuntu xenial-security/multiverse 
Translation-en [28 B]
-     Get:11 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 
[1,201 kB]
-     Get:12 http://gb.archive.ubuntu.com/ubuntu xenial/main i386 Packages 
[1,196 kB]
-     Get:13 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en_GB 
[426 kB]
-     Get:14 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en 
[568 kB]
-     Get:15 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 DEP-11 
Metadata [733 kB]
-     Get:16 http://gb.archive.ubuntu.com/ubuntu xenial/main DEP-11 64x64 Icons 
[409 kB]
-     Get:17 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 
Packages [8,344 B]
-     Get:18 http://gb.archive.ubuntu.com/ubuntu xenial/restricted i386 
Packages [8,684 B]
-     Get:19 http://gb.archive.ubuntu.com/ubuntu xenial/restricted 
Translation-en_GB [2,556 B]
-     Get:20 http://gb.archive.ubuntu.com/ubuntu xenial/restricted 
Translation-en [2,908 B]
-     Get:21 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 DEP-11 
Metadata [186 B]
-     Get:22 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 
[7,532 kB]
-     Get:23 http://gb.archive.ubuntu.com/ubuntu xenial/universe i386 Packages 
[7,512 kB]
-     Get:24 http://gb.archive.ubuntu.com/ubuntu xenial/universe 
Translation-en_GB [3,040 kB]
-     Get:25 http://gb.archive.ubuntu.com/ubuntu xenial/universe Translation-en 
[4,354 kB]
-     Get:26 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 DEP-11 
Metadata [3,410 kB]
-     Get:27 http://gb.archive.ubuntu.com/ubuntu xenial/universe DEP-11 64x64 
Icons [7,448 kB]
-     Get:28 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 
Packages [144 kB]
-     Get:29 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse i386 
Packages [140 kB]
-     Get:30 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse 
Translation-en_GB [88.1 kB]
-     Get:31 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse 
Translation-en [106 kB]
-     Get:32 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 DEP-11 
Metadata [63.8 kB]
-     Get:33 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse DEP-11 64x64 
Icons [230 kB]
-     Get:34 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages [28 B]
-     Get:35 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main i386 
Packages [28 B]
-     Get:36 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main 
Translation-en [28 B]
-     Get:37 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted 
amd64 Packages [28 B]
-     Get:38 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted i386 
Packages [28 B]
-     Get:39 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted 
Translation-en [28 B]
-     Get:40 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 
Packages [28 B]
-     Get:41 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe i386 
Packages [28 B]
-     Get:42 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe 
Translation-en [28 B]
-     Get:43 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse 
amd64 Packages [28 B]
-     Get:44 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse i386 
Packages [28 B]
-     Get:45 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse 
Translation-en [28 B]
-     Get:46 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main amd64 
Packages [28 B]
-     Get:47 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main i386 
Packages [28 B]
-     Get:48 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main 
Translation-en [28 B]
-     Get:49 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
amd64 Packages [28 B]
-     Get:50 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
i386 Packages [28 B]
-     Get:51 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
Translation-en [28 B]
-     Get:52 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe 
amd64 Packages [28 B]
-     Get:53 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe i386 
Packages [28 B]
-     Get:54 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe 
Translation-en [28 B]
-     Get:55 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
amd64 Packages [28 B]
-     Get:56 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
i386 Packages [28 B]
-     Get:57 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
Translation-en [28 B]
-     Fetched 39.0 MB in 7min 59s (81.3 kB/s)                                   
     
-     AppStream cache update completed, but some metadata was ignored due to 
errors.
-     Reading package lists... Done
+     Get:1 http://gb.archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
+     Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease
+     Get:3 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease [82.2 
kB]
+     Get:4 http://security.ubuntu.com/ubuntu xenial-security/main i386 
Packages [28 B]
+     Get:5 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease 
[82.2 kB]
+     Get:6 http://security.ubuntu.com/ubuntu xenial-security/restricted i386 
Packages [28 B]
+     Get:7 http://security.ubuntu.com/ubuntu xenial-security/universe i386 
Packages [28 B]
+     Get:8 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 
Packages [28 B]
+     Get:9 http://security.ubuntu.com/ubuntu xenial-security/multiverse i386 
Packages [28 B]
+     Get:10 http://security.ubuntu.com/ubuntu xenial-security/multiverse 
Translation-en [28 B]
+     Get:11 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages 
[1,201 kB]
+     Get:12 http://gb.archive.ubuntu.com/ubuntu xenial/main i386 Packages 
[1,196 kB]
+     Get:13 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en_GB 
[426 kB]
+     Get:14 http://gb.archive.ubuntu.com/ubuntu xenial/main Translation-en 
[568 kB]
+     Get:15 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 DEP-11 
Metadata [733 kB]
+     Get:16 http://gb.archive.ubuntu.com/ubuntu xenial/main DEP-11 64x64 Icons 
[409 kB]
+     Get:17 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 
Packages [8,344 B]
+     Get:18 http://gb.archive.ubuntu.com/ubuntu xenial/restricted i386 
Packages [8,684 B]
+     Get:19 http://gb.archive.ubuntu.com/ubuntu xenial/restricted 
Translation-en_GB [2,556 B]
+     Get:20 http://gb.archive.ubuntu.com/ubuntu xenial/restricted 
Translation-en [2,908 B]
+     Get:21 http://gb.archive.ubuntu.com/ubuntu xenial/restricted amd64 DEP-11 
Metadata [186 B]
+     Get:22 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages 
[7,532 kB]
+     Get:23 http://gb.archive.ubuntu.com/ubuntu xenial/universe i386 Packages 
[7,512 kB]
+     Get:24 http://gb.archive.ubuntu.com/ubuntu xenial/universe 
Translation-en_GB [3,040 kB]
+     Get:25 http://gb.archive.ubuntu.com/ubuntu xenial/universe Translation-en 
[4,354 kB]
+     Get:26 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64 DEP-11 
Metadata [3,410 kB]
+     Get:27 http://gb.archive.ubuntu.com/ubuntu xenial/universe DEP-11 64x64 
Icons [7,448 kB]
+     Get:28 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 
Packages [144 kB]
+     Get:29 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse i386 
Packages [140 kB]
+     Get:30 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse 
Translation-en_GB [88.1 kB]
+     Get:31 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse 
Translation-en [106 kB]
+     Get:32 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse amd64 DEP-11 
Metadata [63.8 kB]
+     Get:33 http://gb.archive.ubuntu.com/ubuntu xenial/multiverse DEP-11 64x64 
Icons [230 kB]
+     Get:34 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages [28 B]
+     Get:35 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main i386 
Packages [28 B]
+     Get:36 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main 
Translation-en [28 B]
+     Get:37 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted 
amd64 Packages [28 B]
+     Get:38 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted i386 
Packages [28 B]
+     Get:39 http://gb.archive.ubuntu.com/ubuntu xenial-updates/restricted 
Translation-en [28 B]
+     Get:40 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 
Packages [28 B]
+     Get:41 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe i386 
Packages [28 B]
+     Get:42 http://gb.archive.ubuntu.com/ubuntu xenial-updates/universe 
Translation-en [28 B]
+     Get:43 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse 
amd64 Packages [28 B]
+     Get:44 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse i386 
Packages [28 B]
+     Get:45 http://gb.archive.ubuntu.com/ubuntu xenial-updates/multiverse 
Translation-en [28 B]
+     Get:46 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main amd64 
Packages [28 B]
+     Get:47 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main i386 
Packages [28 B]
+     Get:48 http://gb.archive.ubuntu.com/ubuntu xenial-backports/main 
Translation-en [28 B]
+     Get:49 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
amd64 Packages [28 B]
+     Get:50 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
i386 Packages [28 B]
+     Get:51 http://gb.archive.ubuntu.com/ubuntu xenial-backports/restricted 
Translation-en [28 B]
+     Get:52 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe 
amd64 Packages [28 B]
+     Get:53 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe i386 
Packages [28 B]
+     Get:54 http://gb.archive.ubuntu.com/ubuntu xenial-backports/universe 
Translation-en [28 B]
+     Get:55 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
amd64 Packages [28 B]
+     Get:56 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
i386 Packages [28 B]
+     Get:57 http://gb.archive.ubuntu.com/ubuntu xenial-backports/multiverse 
Translation-en [28 B]
+     Fetched 39.0 MB in 7min 59s (81.3 kB/s)
+     AppStream cache update completed, but some metadata was ignored due to 
errors.
+     Reading package lists... Done
  
  And when running "sudo appstreamcli refresh --force --verbose" the
  output is as follows:
  
-     ** (appstreamcli:2227): DEBUG: Refreshing AppStream cache
-     ** (appstreamcli:2227): DEBUG: Reading: 
/usr/share/app-info/xmls/org.freedesktop.fwupd.xml
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_restricted_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_main_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_Components-amd64.yml.gz
-     ** (appstreamcli:2227): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml
-     ** (appstreamcli:2227): DEBUG: Detected colliding ids: plan.desktop was 
already added with the same priority.
-     ** (appstreamcli:2227): DEBUG: Detected colliding ids: flcheckers.desktop 
was already added with the same priority.
-     ** (appstreamcli:2227): DEBUG: Detected colliding ids: flblocks.desktop 
was already added with the same priority.
-     ** (appstreamcli:2227): DEBUG: Detected colliding ids: flsudoku.desktop 
was already added with the same priority.
-     ** (appstreamcli:2227): DEBUG: zathura-pdf-poppler.desktop extends 
zathura.desktop, but zathura.desktop was not found.
-     ** (appstreamcli:2227): DEBUG: WARNING: Skipped component 
'com.steelseries.rival-legacy.firmware': The component is invalid.
-     ** (appstreamcli:2227): DEBUG: Removing old rebuild-dir from previous 
database rebuild.
-     AppStream cache update completed, but some metadata was ignored due to 
errors.
+     ** (appstreamcli:2227): DEBUG: Refreshing AppStream cache
+     ** (appstreamcli:2227): DEBUG: Reading: 
/usr/share/app-info/xmls/org.freedesktop.fwupd.xml
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_universe_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_multiverse_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_main_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial_restricted_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/gb.archive.ubuntu.com_ubuntu_dists_xenial-updates_multiverse_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_main_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_restricted_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_universe_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: 
/var/lib/app-info/yaml/security.ubuntu.com_ubuntu_dists_xenial-security_multiverse_dep11_Components-amd64.yml.gz
+     ** (appstreamcli:2227): DEBUG: Reading: /var/cache/app-info/xmls/fwupd.xml
+     ** (appstreamcli:2227): DEBUG: Detected colliding ids: plan.desktop was 
already added with the same priority.
+     ** (appstreamcli:2227): DEBUG: Detected colliding ids: flcheckers.desktop 
was already added with the same priority.
+     ** (appstreamcli:2227): DEBUG: Detected colliding ids: flblocks.desktop 
was already added with the same priority.
+     ** (appstreamcli:2227): DEBUG: Detected colliding ids: flsudoku.desktop 
was already added with the same priority.
+     ** (appstreamcli:2227): DEBUG: zathura-pdf-poppler.desktop extends 
zathura.desktop, but zathura.desktop was not found.
+     ** (appstreamcli:2227): DEBUG: WARNING: Skipped component 
'com.steelseries.rival-legacy.firmware': The component is invalid.
+     ** (appstreamcli:2227): DEBUG: Removing old rebuild-dir from previous 
database rebuild.
+     AppStream cache update completed, but some metadata was ignored due to 
errors.
  
  I have found this to be present on all Ubuntu 16.04 flavours which I
  have tried, I have also been informed that this is likely to be a
- server-side issue.
+ server-side issue. You can also see from this
+ https://askubuntu.com/q/761884/364819 that many are experiencing it.

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https://bugs.launchpad.net/bugs/1575248

Title:
  "AppStream cache update completed, but some metadata was ignored due
  to errors." on "sudo apt-get update"

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