$ ls -l /etc/resolv.conf 
lrwxrwxrwx 1 root root 29 Feb 11  2012 /etc/resolv.conf -> 
../run/resolvconf/resolv.conf


$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 66.185.16.130
nameserver 66.185.16.131
nameserver


$ ls -l /etc/default/resolvconf
ls: cannot access /etc/default/resolvconf: No such file or directory


$ ls -l /etc/resolvconf/resolv.conf.d
total 8
-rw-r--r-- 1 root root   0 Feb  1  2012 base
-rw-r--r-- 1 root root 151 Feb  1  2012 head
-rw-r--r-- 1 root root  26 Feb 11  2012 original


$ for F in /etc/resolvconf/resolv.conf.d/* ; do echo === $F === ; cat $F ; done
=== /etc/resolvconf/resolv.conf.d/base ===
=== /etc/resolvconf/resolv.conf.d/head ===
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
=== /etc/resolvconf/resolv.conf.d/original ===
nameserver 192.168.10.254


$ ls -l /run/resolvconf
total 4
-rw-r--r-- 1 root root   0 Oct 15 14:00 enable-updates
drwxr-xr-x 2 root root  60 Oct 15 14:00 interface
-rw-r--r-- 1 root root 212 Oct 15 15:46 resolv.conf


$ for F in /run/resolvconf/interface/* ; do echo === $F === ; cat $F ; done
=== /run/resolvconf/interface/br0.inet ===
nameserver 66.185.16.130
nameserver
nameserver 66.185.16.131


$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#auto eth0
#       iface eth0 inet dhcp

auto eth0 
iface eth0 inet manual 

auto br0
iface br0 inet static
        address 199.195.144.32
        netmask 255.255.255.0
        network 199.195.144.0
        broadcast 199.195.144.255
        gateway 199.195.144.1 
        dns-nameservers 66.185.16.130 66.185.16.131
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
        bridge_maxwait 0


$ ls -l /run/network
total 4
-rw-r--r-- 1 root root 24 Oct 15 14:00 ifstate
-rw-r--r-- 1 root root  0 Oct 15 14:00 ifup.br0
-rw-r--r-- 1 root root  0 Oct 15 14:00 ifup.eth0
-rw-r--r-- 1 root root  0 Oct 15 14:00 ifup.lo
drwxr-xr-x 2 root root 40 Oct 15 14:00 static-network-up-emitted


$ cat /run/network/ifstate
br0=br0
lo=lo
eth0=eth0


$ cat /etc/NetworkManager/NetworkManager.conf
cat: /etc/NetworkManager/NetworkManager.conf: No such file or directory


$ dpkg -l resolvconf network-manager dnsmasq
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                Version             Description
+++-===================-===================-======================================================
un  dnsmasq             <none>              (no description available)
un  network-manager     <none>              (no description available)
ii  resolvconf          1.63ubuntu16        name server information handler


$ ps -elf | grep '\(Net\|dh\|dns\|ppp\|pptp\|vpn\)'
5 S 108       1401     1  0  80   0 -  6493 poll_s Oct15 ?        00:00:02 
dnsmasq -u lxc-dnsmasq --strict-order --bind-interfaces 
--pid-file=/var/run/lxc/dnsmasq.pid --conf-file= --listen-address 10.0.3.1 
--dhcp-range 10.0.3.2,10.0.3.254 --dhcp-lease-max=253 --dhcp-no-override 
--except-interface=lo --interface=lxcbr0
0 S rob       1512  1327  0  80   0 -  2346 pipe_w 10:21 pts/0    00:00:00 grep 
\(Net\|dh\|dns\|ppp\|pptp\|vpn\)
5 S 106       1757     1  0  80   0 -  6493 poll_s Oct15 ?        00:00:03 
/usr/sbin/dnsmasq -u libvirt-dnsmasq --strict-order --bind-interfaces 
--pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface 
lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 
--dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 
--dhcp-no-override
1 S root      2375  1516  0  80   0 -  1814 poll_s Oct15 ?        00:00:00 
dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf 
/var/lib/dhcp/dhclient.eth0.leases -1 eth0
1 S root      2462  1673  0  80   0 -  1814 poll_s Oct15 ?        00:00:00 
dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf 
/var/lib/dhcp/dhclient.eth0.leases -1 eth0
1 S root      2588  1672  0  80   0 -  1814 poll_s Oct15 ?        00:00:00 
dhclient3 -e IF_METRIC=100 -pf /var/run/dhclient.eth0.pid -lf 
/var/lib/dhcp/dhclient.eth0.leases -1 eth0

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https://bugs.launchpad.net/bugs/1067043

Title:
  resolvconf adds an empty "nameserver" record into /etc/resolv.conf

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