update-manager crashed with ImportError in __main__: No module named UpdateManager.UpdateManager

[Karma Dorje]

% lsb_release -rd
Description: Ubuntu quantal (development branch)
Release: 12.10

% LANG=en apt-cache policy update-manager
update-manager:
  Installed: 1:0.166
  Candidate: 1:0.166
  Version table:
 *** 1:0.166 0
        500 http://archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: update-manager 1:0.166
ProcVersionSignature: Ubuntu 3.5.0-3.3-generic 3.5.0-rc5
Uname: Linux 3.5.0-3-generic x86_64
ApportVersion: 2.3-0ubuntu3
Aptdaemon:

Architecture: amd64
CheckboxSubmission: b0ff20e1097011bb5fd96e7239c1968b
CheckboxSystem: 21aa6c17e1fc79cc65eed2169d1b6afc
CrashCounter: 1
Date: Wed Jul 11 13:23:43 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-time' b'1341936977'
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'744'
 b'com.ubuntu.update-manager' b'window-width' b'1301'
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager --no-update --no-focus-on-map
PythonArgs: ['/usr/bin/update-manager', '--no-update', '--no-focus-on-map']
SourcePackage: update-manager
Title: update-manager crashed with ImportError in __main__: No module named UpdateManager.UpdateManager
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/update-manager", line 37, in <module>
     from UpdateManager.UpdateManager import UpdateManager
 ImportError: No module named UpdateManager.UpdateManager
UpgradeStatus: Upgraded to quantal on 2012-07-01 (9 days ago)
UserGroups: adm admin cdrom dialout dip lpadmin plugdev sambashare sudo

[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 #1022994, 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.