[Bug 1650555] Re: nsswitch.conf configuration doesn't work with mdns hosts

[Sebastian Malcolm]

*** This bug is a duplicate of bug 1641328 ***
    https://bugs.launchpad.net/bugs/1641328

Use the re-ordering of hosts line in nsswitch.conf posted by Mark Tearle in #1641328:
   files mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns

This is better than removing "resolve [!UNAVAIL=return]" because recent Ubuntu releases should continue to use systemd-resolved for name resolution. It's man page explains several benefits, see:
 https://www.freedesktop.org/software/systemd/man/systemd-resolved.service.html

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Title:
  nsswitch.conf configuration doesn't work with mdns hosts

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  On a fresh Ubuntu 16.10 (yakkety) install, resolution of mDNS hosts
  doesn't work anymore (it used to in xenial)

  I can resolve names with avahi-resolve but ssh,ping,etc. fail to
  resolve.

  After some digging I found out that what's causing it is the "resolve"
  option in /etc/nsswitch.conf:

  hosts:          files resolve [!UNAVAIL=return] mdns4_minimal
  [NOTFOUND=return] dns

  Changing it to

  hosts:          files mdns4_minimal [NOTFOUND=return] dns

  (as it was on xenial) makes mDNS work again.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: libnss-resolve 231-9ubuntu2
  ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
  Uname: Linux 4.8.0-30-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  Date: Fri Dec 16 15:16:38 2016
  InstallationDate: Installed on 2016-10-22 (54 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)

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