software-properties-gtk crashed with TypeError in __new__(): object of type 'NoneType' has no len()

[awol]

draging the software sources window

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: software-properties-gtk 0.81.9
ProcVersionSignature: Ubuntu 3.0.0-11.18-powerpc64-smp 3.0.4
Uname: Linux 3.0.0-11-powerpc64-smp ppc64
ApportVersion: 1.23-0ubuntu1
Architecture: powerpc
Date: Sat Sep 17 19:26:36 2011
ExecutablePath: /usr/bin/software-properties-gtk
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk --open-tab 2
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk', '--open-tab', '2']
SourcePackage: software-properties
Title: software-properties-gtk crashed with TypeError in __new__(): object of type 'NoneType' has no len()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #818567, 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.