update-manager crashed with GError in __init__()

[Linuxexperte]

Binary package hint: update-manager

my Problem is, that I cant't open the update-manager any more for receiving updates.
I only get the report, that the Update-manager closed unexpectedly.

So how can I reopen the Update-Manager again?

Greetings
Linuxexperte

ProblemType: Crash
Architecture: amd64
Date: Mon Aug 31 21:22:43 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/update-manager
InterpreterPath: /usr/bin/python2.6
Package: update-manager 1:0.124.8
PackageArchitecture: all
ProcCmdline: /usr/bin/python2.6 /usr/bin/update-manager
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-9.29-generic
PythonArgs: ['/usr/bin/update-manager']
SourcePackage: update-manager
Title: update-manager crashed with GError in __init__()
Uname: Linux 2.6.31-9-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare