update-manager crashed with ImportError in /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeQuirks.py: No module named plugincore.manager

[Christopher]

Crashed on boot. I have the python updates from this morning, but there are a number of updates that can't be installed due to conflicts.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: update-manager 1:0.163
ProcVersionSignature: Ubuntu 3.4.0-5.11-generic 3.4.0
Uname: Linux 3.4.0-5-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 2.2.3-0ubuntu6
Architecture: amd64
Date: Wed Jun 20 08:46:55 2012
DuplicateOf: https://bugs.launchpad.net/bugs/1013490
ExecutablePath: /usr/bin/update-manager
GsettingsChanges: b'com.ubuntu.update-manager' b'launch-time' b'1339345462'
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
InterpreterPath: /usr/bin/python3.2mu
PackageArchitecture: all
ProcCmdline: /usr/bin/python3.2 /usr/bin/update-manager --dist-upgrade
ProcCwd: /home/chris
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
 TERM=unknown
PythonArgs: ['/usr/bin/update-manager', '--dist-upgrade']
SourcePackage: update-manager
Title: update-manager crashed with ImportError in /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeQuirks.py: No module named plugincore.manager
UpgradeStatus: Upgraded to quantal on 2012-06-15 (4 days ago)
UserGroups:

VarLogDistupgradeTermlog:

[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 #1013490, 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.