[Bug 1563945] Re: package avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1

[David Martinka]

Added "set -x" to the prerm script at /var/lib/dpkg/info/avahi-
dnsconfd.prerm for more verbose console output and re-ran apt update &&
apt upgrade and it looks like it's failing here:

deb-systemd-invoke stop avahi-daemon.socket

```
The following packages will be upgraded:
  avahi-dnsconfd
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/14.1 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
(Reading database ... 459430 files and directories currently installed.)
Preparing to unpack .../avahi-dnsconfd_0.6.32~rc+dfsg-1ubuntu2.1_amd64.deb ...
+ dpkg-maintscript-helper rm_conffile /etc/default/avahi-dnsconfd 0.6.26-1~ avahi-dnsconfd -- upgrade 0.6.32~rc+dfsg-1ubuntu2.1
+ [ -d /run/systemd/system ]
+ deb-systemd-invoke stop avahi-daemon.socket
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 ...
Job for avahi-daemon.socket canceled.
dpkg: error processing archive /var/cache/apt/archives/avahi-dnsconfd_0.6.32~rc+dfsg-1ubuntu2.1_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/avahi-dnsconfd_0.6.32~rc+dfsg-1ubuntu2.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
```

When run manually this command fails as well:

```
$ deb-systemd-invoke stop avahi-daemon.socket
Job for avahi-daemon.socket canceled.

$ deb-systemd-invoke status avahi-daemon.socket
● avahi-daemon.socket - Avahi mDNS/DNS-SD Stack Activation Socket
   Loaded: loaded (/lib/systemd/system/avahi-daemon.socket; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2018-04-05 01:15:39 EDT; 22h ago
   Listen: /var/run/avahi-daemon/socket (Stream)

Apr 05 01:15:39 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 22:50:26 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 22:50:26 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 22:50:26 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 23:20:31 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 23:20:31 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 23:20:31 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
Apr 05 23:21:29 MYCOMPUTER systemd[1]: Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
```

-- 
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https://bugs.launchpad.net/bugs/1563945

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

Status in avahi package in Ubuntu:
  Confirmed

Bug description:
  interesting issues while updating packages this morning...

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6
  Uname: Linux 4.4.0-16-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Wed Mar 30 09:33:28 2016
  DpkgTerminalLog:
   Removing avahi-discover (0.6.32~rc+dfsg-1ubuntu2) ...
   Removing avahi-dnsconfd (0.6.32~rc+dfsg-1ubuntu2) ...
   Job for avahi-daemon.socket canceled.
   dpkg: error processing package avahi-dnsconfd (--remove):
    subprocess installed pre-removal script returned error exit status 1
  DuplicateSignature:
   Removing avahi-dnsconfd (0.6.32~rc+dfsg-1ubuntu2) ...
   Job for avahi-daemon.socket canceled.
   dpkg: error processing package avahi-dnsconfd (--remove):
    subprocess installed pre-removal script returned error exit status 1
  ErrorMessage: subprocess installed pre-removal script returned error exit status 1
  InstallationDate: Installed on 2016-01-06 (83 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.9
  SourcePackage: avahi
  Title: package avahi-dnsconfd 0.6.32~rc+dfsg-1ubuntu2 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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