update-manager crashed with SIGABRT in raise()

[Niclas Kiefer]

I wanted to reinstall >>unity<< but it didnt work out, according to this crash

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.7
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
Date: Mon Mar 12 18:39:29 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:

InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager --dist-upgrade
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
 TERM=unknown
Signal: 6
SourcePackage: update-manager
StacktraceTop:
 raise () from /lib/i386-linux-gnu/libc.so.6
 abort () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /lib/i386-linux-gnu/libc.so.6
 __assert_fail () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /usr/lib/i386-linux-gnu/libX11.so.6
Title: update-manager crashed with SIGABRT in raise()
UpgradeStatus: Upgraded to precise on 2012-03-12 (0 days ago)
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 #930839, 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.