janitord crashed with SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)

[Anand Kumria]

I was having janitor (see #889617) remove unnecessary packages.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: computer-janitor 2.1.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Nov 12 21:25:18 2011
ExecutablePath: /usr/share/computerjanitor/janitord
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/share/computerjanitor/janitord
ProcEnviron:

PythonArgs: ['/usr/share/computerjanitor/janitord']
SourcePackage: computer-janitor
Title: janitord crashed with SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Traceback: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
UpgradeStatus: Upgraded to oneiric on 2011-11-12 (0 days ago)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #820883, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.