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

[macice]

Running Ubuntu 11.10 64 bit 1/9 Daily Build under Virtualbox 4.1.2 (Windows host)

used software sources to change download mirror when software sources applet crashed

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: software-properties-gtk 0.81.9
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
Architecture: amd64
Date: Thu Sep 1 09:40:50 2011
ExecutablePath: /usr/bin/software-properties-gtk
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110830)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no username)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk']
SourcePackage: software-properties
Title: software-properties-gtk crashed with DBusException in call_blocking(): com.ubuntu.SoftwareProperties.PermissionDeniedByPolicy: com.ubuntu.softwareproperties.applychanges
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 #836262, 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.