software-properties-gtk crashed with DBusException in call_blocking(): com.ubuntu.SoftwareProperties.PermissionDeniedByPolicy: com.ubuntu.softwareproperties.applychanges

[Pioneer Skies]

The crash happens anytime I try to re-activate a 3rd party's repo within the software center (edit->software sources)

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: software-properties-gtk 0.81.9
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sun Aug 28 14:33:07 2011
ExecutablePath: /usr/bin/software-properties-gtk
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 0
PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '0']
SourcePackage: software-properties
Title: software-properties-gtk crashed with DBusException in call_blocking(): com.ubuntu.SoftwareProperties.PermissionDeniedByPolicy: com.ubuntu.softwareproperties.applychanges
UpgradeStatus: Upgraded to oneiric on 2011-08-27 (0 days ago)
UserGroups: adm admin cdrom dialout dip lpadmin plugdev sambashare video

[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 #828850, 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.

[Pioneer Skies (alessandro-fazzi)]

Apport retracing service said to me that

*** This bug is a duplicate of bug 828850 ***
   https://bugs.launchpad.net/bugs/828850

That should be ok, but bug 828850 seems not existsting...