[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

[Trent Lloyd]

Analysis here appears related:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768620

Seems the interactions here are quite complex

To reproduce the problem, you can do on xenial:
(install old version)
# 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

(in a second terminal, leaves this running)
while true; do avahi-browse -a; done

(back in the first terminal)
apt upgrade # will upgrade from the xenial version 1ubuntu2 to xenial-updates version 1ubuntu2.1


Looks like the --restart-after-upgrade change may be what we need except I can't see where that's actually used in the current Ubuntu or Debian package.  Seems this shipped patch may have "fixed" the issue instead.  This patch is in bionic, but not in xenial where are are seeing this issue reported.

lathiat at optane:~/src/debian/avahi-0.7$ cat debian/patches/no-systemd-also.patch 
Description: Don't use 'Also=' in dnsconfd systemd unit
 'Also=avahi-daemon.socket' means that 'systemctl disable avahi-dnsconfd'
 will also disable avahi-daemon.socket, which is definitely not what we
 want, and it also causes debhelper to throw an error.  Just drop this entry
 from the configuration.
Author: Steve Langasek <steve.langasek at ubuntu.com>
Last-Modified: 2018-01-02 20:30:00 -0800
Bug-Debian: https://bugs.debian.org/878911

Index: avahi-0.7-3ubuntu1/avahi-dnsconfd/avahi-dnsconfd.service.in
===================================================================
--- avahi-0.7-3ubuntu1.orig/avahi-dnsconfd/avahi-dnsconfd.service.in
+++ avahi-0.7-3ubuntu1/avahi-dnsconfd/avahi-dnsconfd.service.in
@@ -26,4 +26,3 @@
 
 [Install]
 WantedBy=multi-user.target
-Also=avahi-daemon.socket



** Bug watch added: Debian Bug tracker #768620
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768620

** Bug watch added: Debian Bug tracker #878911
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878911

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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:
  Triaged

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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