Installation problem - bad version number

[gpk]

Binary package hint: dansguardian

Dansguardian complains during installation via dpkg. (Possibly, this is a dpkg bug?)
Dpkg says that the version has bad syntax: invalid character in version number.
See below. However, it seems to operate after the upgrade and the complaint.

Preparing to replace dansguardian 2.10.1.1-2 (using .../dansguardian_2.10.1.1-2ubuntu0.1_amd64.deb) ...
 * Stopping DansGuardian dansguardian [ OK ]
dpkg: version 'dansguardian_2.8.0.6-antivirus-6.4.4.1-4' has bad syntax: invalid character in version number
Unpacking replacement dansguardian ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Setting up ubuntu-docs (10.10.4) ...
Setting up libparted0debian1 (2.3-2ubuntu2) ...
Setting up parted (2.3-2ubuntu2) ...
Setting up dansguardian (2.10.1.1-2ubuntu0.1) ...
Installing new version of config file /etc/init.d/dansguardian ...

dpkg: version 'dansguardian_2.8.0.6-antivirus-6.4.4.1-4' has bad syntax: invalid character in version number
 * Starting DansGuardian dansguardian [ OK ]
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place

Current status: 0 updates [-4].

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: dansguardian 2.10.1.1-2ubuntu0.1
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic x86_64
Architecture: amd64
Date: Fri Dec 10 22:29:35 2010
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: dansguardian

[Launchpad Janitor (janitor)]

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

[psr (psrdotcom-gmail)]

When I was trying to install dansguardian, I got the similar error in my Ubuntu 11.10 32-bit OS.