[Bug 1315741] Re: After upgrading from 12.04 to 14.04, network manager puts 127.0.0.1 instead of 127.0.1.1 in resolv.conf

[Thomas Hood]

/run/resolvconf/interface/lo.dnsmasq arises from /etc/init.d/dnsmasq
registering the standalone dnsmasq's listen address 127.0.0.1 with
resolvconf. Normally the standalone dnsmasq listens at all addresses
including 127.0.0.1. Did you have the standalone dnsmasq running?

It is normal that "nameserver 127.0.1.1" was in
/run/resolvconf/interface/NetworkManager but not included in
resolv.conf. Resolvconf normally includes at most one loopback address
in resolv.conf.

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https://bugs.launchpad.net/bugs/1315741

Title:
  After upgrading from 12.04 to 14.04, network manager puts 127.0.0.1
  instead of 127.0.1.1 in resolv.conf

Status in “resolvconf” package in Ubuntu:
  New

Bug description:
  I upgraded from 12.04 to 14.04 and found that I had no DNS. After a
  little searching I noticed that dnsmasq, as started by Network
  Manager, was listening on 127.0.1.1, yet /etc/resolv.conf was being
  auto-populated with 127.0.0.1, so DNS lookups were failing.

  Manually adding 127.0.1.1 to /etc/resolv.conf lets DNS work until the
  network state changes, then it gets overwritten again with 127.0.0.1.

  I've worked around the issue by adding "nameserver 127.0.1.1" to
  /etc/resolvconf/resolv.conf.d/head and restarting network-manager.
  Something left over from 12.04 is apparently still causing 127.0.0.1
  to be written instead of 127.0.1.1.

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