package libpostproc52 4:0.8.10-0ubuntu0.12.04.1 failed to install/upgrade: libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances

[Damianus500]

This is what I received when I recently upgraded my xubuntu 12.04 to ubuntu 14.04

All done, no errors.
All fonts downloaded and installed.
Processing triggers for fontconfig (2.11.0-0ubuntu4) ...
Processing triggers for doc-base (0.10.5) ...
Processing 1 changed doc-base file...
Registering documents with scrollkeeper...
Processing triggers for libglib2.0-0:amd64 (2.40.0-2) ...
Processing triggers for libglib2.0-0:i386 (2.40.0-2) ...
Processing triggers for bamfdaemon (0.5.1+14.04.20140409-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils (0.22-1ubuntu1) ...
Processing triggers for mime-support (3.54ubuntu1) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for gconf2 (3.2.6-0ubuntu2) ...
Processing triggers for shared-mime-info (1.2-0ubuntu3) ...
Processing triggers for hicolor-icon-theme (0.13-1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/libpostproc52_6%3a0.git20120821-4_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libpostproc52 4:0.8.10-0ubuntu0.12.04.1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Tue Apr 29 10:42:23 2014
Dependencies:
 gcc-4.9-base 4.9-20140406-0ubuntu1
 libc6 2.19-0ubuntu6
 libgcc1 1:4.9-20140406-0ubuntu1
 multiarch-support 2.19-0ubuntu6
DuplicateSignature: package:libpostproc52:4:0.8.10-0ubuntu0.12.04.1:libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances
ErrorMessage: libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances
InstallationDate: Installed on 2012-05-30 (698 days ago)
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: libav
Title: package libpostproc52 4:0.8.10-0ubuntu0.12.04.1 failed to install/upgrade: libpostproc52:amd64 6:0.git20120821-4 (Multi-Arch: no) is not co-installable with libpostproc52 which has multiple installed instances
UpgradeStatus: Upgraded to trusty on 2014-04-18 (10 days ago)