[Bug 1682690] [NEW] install, remove, install same version: nsswitch.conf bad

[Greg Minshall]

Public bug reported:

if i install libnss-mdns (via avahi-daemon via cups, say), then
*deinstall* it, then *reinstall* it, /etc/nsswitch.conf's host: line
doesn't get the mdns entry added (back).  (or, so it appears to me.)

i'm guessing that on the second add, libnss-mdns.postinst is being
called with "configure 0.10-7", or some such, which causes the postinst
script to decide it's being re-installed and doesn't need to modify
/etc/nsswitch.conf.  unfortunately, the intervening remove removed that
initial changes to /etc/nsswitch.conf.

the symptoms, in my case was CUPS complaining "Unable to locate printer
"BRN-015165.local".

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libnss-mdns 0.10-7
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
Uname: Linux 4.4.0-72-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: LXDE
Date: Thu Apr 13 18:20:41 2017
InstallationDate: Installed on 2017-04-10 (3 days ago)
InstallationMedia: Lubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
SourcePackage: nss-mdns
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nss-mdns (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1682690

Title:
  install, remove, install same version: nsswitch.conf bad

Status in nss-mdns package in Ubuntu:
  New

Bug description:
  if i install libnss-mdns (via avahi-daemon via cups, say), then
  *deinstall* it, then *reinstall* it, /etc/nsswitch.conf's host: line
  doesn't get the mdns entry added (back).  (or, so it appears to me.)

  i'm guessing that on the second add, libnss-mdns.postinst is being
  called with "configure 0.10-7", or some such, which causes the
  postinst script to decide it's being re-installed and doesn't need to
  modify /etc/nsswitch.conf.  unfortunately, the intervening remove
  removed that initial changes to /etc/nsswitch.conf.

  the symptoms, in my case was CUPS complaining "Unable to locate
  printer "BRN-015165.local".

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: libnss-mdns 0.10-7
  ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
  Uname: Linux 4.4.0-72-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Thu Apr 13 18:20:41 2017
  InstallationDate: Installed on 2017-04-10 (3 days ago)
  InstallationMedia: Lubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
  SourcePackage: nss-mdns
  UpgradeStatus: No upgrade log present (probably fresh install)

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