update-manager crashed with SIGABRT in raise()

[Vince]

Started update manager to install todays updates.It told me not all updates could be installed some packages held back(compbiz and lib) and run a partial upgrade.While running the upgrade.I got an error message."can't guess meta packages" couldn't find unubtu-desktop.and to install it.I removed the ubuntu-desk top.ran the up date in the terminal,same packages held back ten I reinstalled ubuntu-desktop,rebooted,run update manager.I was told to run a partial upgrade.then update manager crashed

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.4
ProcVersionSignature: Ubuntu 3.2.0-15.24-generic 3.2.5
Uname: Linux 3.2.0-15-generic i686
NonfreeKernelModules: wl
ApportVersion: 1.91-0ubuntu1
Architecture: i386
Date: Mon Feb 13 10:49:26 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:

InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager --dist-upgrade
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
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 2012-02-13 (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 #930004, 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.