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

[Hail Holy Ghost]

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

Public bug reported:

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:

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash dist-upgrade quantal

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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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