[Bug 1362725] Re: trying to update from 12.04 to 14.04 and it crashes

[robin]

*** This bug is a duplicate of bug 1356142 ***
    https://bugs.launchpad.net/bugs/1356142

** This bug has been marked a duplicate of bug 1356142
   not able to upgrade from 12.4 to 14.4

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https://bugs.launchpad.net/bugs/1362725

Title:
  trying to update from 12.04 to 14.04 and it crashes

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

Bug description:
  
  An unresolvable problem occurred while calculating the upgrade.

   This can be caused by:
   * Upgrading to a pre-release version of Ubuntu
   * Running the current pre-release version of Ubuntu
   * Unofficial software packages not provided by Ubuntu

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-67.101-generic-pae 3.2.60
  Uname: Linux 3.2.0-67-generic-pae i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: i386
  Date: Thu Aug 28 10:28:55 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1409246766
   com.ubuntu.update-manager window-height 518
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-08-28 (0 days ago)
  VarLogDistupgradeTermlog:

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