package avahi-daemon 0.7-3.1ubuntu1.1 failed to install/upgrade: installed avahi-daemon package post-installation script subprocess returned error exit status 2

[Zylak]

Several DPKG tasks were spawned and the apt upgrade process could not fork.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: avahi-daemon 0.7-3.1ubuntu1.1
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
Date: Thu Sep 6 16:49:07 2018
ErrorMessage: installed avahi-daemon package post-installation script subprocess returned error exit status 2
InstallationDate: Installed on 2018-05-20 (108 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: avahi
Title: package avahi-daemon 0.7-3.1ubuntu1.1 failed to install/upgrade: installed avahi-daemon package post-installation script subprocess returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.