[Bug 1447842] [NEW] package clamav-base (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[KenWilson]

Public bug reported:

While doing the 15.04 upgrade clamav did not upgrade. I used apt-get
remove clamav packages; however, there seems to be a leftover file from
the upgrade.

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: clamav-base (not installed)
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
Date: Thu Apr 23 15:44:03 2015
DpkgTerminalLog:
 Setting up clamav-base (0.98.6+dfsg-1ubuntu2) ...
 chown: invalid group: ‘clamav:clamav’
 dpkg: error processing package clamav-base (--configure):
  subprocess installed post-installation script returned error exit status 1
DuplicateSignature: package:clamav-base:(not installed):subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-01-09 (104 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1
 apt  1.0.9.7ubuntu4
SourcePackage: clamav
Title: package clamav-base (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to vivid on 2015-04-23 (0 days ago)

** Affects: clamav (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package vivid

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Title:
  package clamav-base (not installed) failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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