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

[d]

no news....... no updates.......i do not know why.....:D

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 i686
NonfreeKernelModules: nvidia
ApportVersion: 2.3-0ubuntu3
Architecture: i386
CrashCounter: 1
Date: Tue Jul 10 22:56:51 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:

InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120612)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager --dist-upgrade
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=el_GR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/update-manager', '--dist-upgrade']
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: No upgrade log present (probably fresh install)
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 #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.