[Bug 1760128] Re: package avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1

[Brian Murray]

Well Launchpad kept timing out when I tried to edit the description so
here's the SRU info.

[Impact]
avahi-dnsconfd fails to upgrade causing lots of bug reports.

[Test Case]
1) sudo apt install avahi-daemon=0.6.32~rc+dfsg-1ubuntu2 avahi-dnsconfd=0.6.32~rc+dfsg-1ubuntu2 avahi-utils=0.6.32~rc+dfsg-1ubuntu2
2) in a separate terminal run 'while true; do avahi-browse -a -t; done
3) sudo apt upgrade avahi-daemon avahi-dnsconfd avahi-utils

With the version of the package from -proposed you should not receive a
crash report and should see the following instead:

Preparing to unpack avahi-dnsconfd_0.6.32~rc+dfsg-1ubuntu3_amd64.deb ...
Job for avahi-daemon.socket canceled.
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
dpkg: ... it looks like that went OK

[Regression Potential]
This has been in bionic for a while with no regressions.

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https://bugs.launchpad.net/bugs/1760128

Title:
  package avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2 failed to
  install/upgrade: subprocess new pre-removal script returned error exit
  status 1

Status in avahi package in Ubuntu:
  Fix Released
Status in avahi source package in Xenial:
  In Progress

Bug description:
  Ubuntu Update 30.03.18

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
  Uname: Linux 4.4.0-116-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Fri Mar 30 16:32:50 2018
  ErrorMessage: subprocess new pre-removal script returned error exit status 1
  InstallationDate: Installed on 2016-01-31 (788 days ago)
  InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160131)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.4
   apt  1.2.26
  SourcePackage: avahi
  Title: package avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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