package wireshark-common 2.6.6-1~ubuntu18.04.0 failed to install/upgrade: installed wireshark-common package post-installation script subprocess returned error exit status 1

[Gary Faulkner]

wireshark group existed as a user group, not a system group.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: wireshark-common 2.6.6-1~ubuntu18.04.0
ProcVersionSignature: Ubuntu 4.15.0-46.49~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-46-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
Date: Tue Mar 26 15:18:14 2019
ErrorMessage: installed wireshark-common package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2017-12-01 (479 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.10
SourcePackage: wireshark
Title: package wireshark-common 2.6.6-1~ubuntu18.04.0 failed to install/upgrade: installed wireshark-common package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2019-03-26 (0 days ago)

[Balint Reczey (rbalint)]

chown root:wireshark /usr/bin/dumpcap fails and the group seem to be present.
Could you please try this command manually and check why it does not work?

[Launchpad Janitor (janitor)]

[Expired for wireshark (Ubuntu) because there has been no activity for 60 days.]