[Bug 1015950] Re: update-manager crashed with ImportError in /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeQuirks.py: No module named plugincore.manager

[Apport retracing service]

*** This bug is a duplicate of bug 1013490 ***
    https://bugs.launchpad.net/bugs/1013490

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.

** Tags removed: need-duplicate-check

** Attachment removed: "ProcMaps.txt"
   https://bugs.launchpad.net/bugs/1015950/+attachment/3198581/+files/ProcMaps.txt

** Attachment removed: "ProcStatus.txt"
   https://bugs.launchpad.net/bugs/1015950/+attachment/3198582/+files/ProcStatus.txt

** This bug has been marked a duplicate of bug 1013490
   update-manager crashed with ImportError in /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeQuirks.py: No module named plugincore.manager

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https://bugs.launchpad.net/bugs/1015950

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

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  Hello,

  I am experiencing many different problems after upgrading to Precise,
  or at least what I thought was precise. The Unity interface is barely
  functional in my opinion (I like the taskbar) so I am attempting to
  convert back to Gnome.

  When I attempt to reinstall GNOME:

  #1 The following packages have unmet dependencies:

  gnome: Depends: gnome-core (= 1:3.0+6ubuntu3) but 1:3.0+6ubuntu3 is to
  be installed

  I have been running in circles trying to get gnome reinstalled.  There
  are so many bugs on my computer now I can't do anything.

  #2 For some reason (I did NOT do this intentionally) I am running a
  development version of 12.10.  This may be the source of my problems.

  I did this: 
  1) sudo sed -i 's/quantal/precise/g' /etc/apt/sources.list
  2) sudo apt-get update && sudo apt-get dist-upgrade
  3) sudo apt-get update
  4) sudo apt-get upgrade

  This link http://askubuntu.com/questions/49869/how-to-roll-back-
  ubuntu-to-a-previous-version was not helpful.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: update-manager 1:0.163
  ProcVersionSignature: Ubuntu 3.5.0-1.1-generic 3.5.0-rc3
  Uname: Linux 3.5.0-1-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.2.3-0ubuntu6
  Architecture: amd64
  Date: Thu Jun 21 04:34:30 2012
  DuplicateOf: https://bugs.launchpad.net/bugs/1013490
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  InterpreterPath: /usr/bin/python3.2mu
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3.2 /usr/bin/update-manager --dist-upgrade
  ProcCwd: /home/david
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.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 2012-06-21 (0 days ago)
  UserGroups:

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