[Bug 1381698] [NEW] upgrade from 12.04 to 14.04 crashes

[fabio]

Public bug reported:

During the upgrade from 12.04 to 14.04.01 this  message appeared:

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

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.17
ProcVersionSignature: Ubuntu 3.2.0-69.103-generic 3.2.62
Uname: Linux 3.2.0-69-generic i686
ApportVersion: 2.0.1-0ubuntu17.7
Architecture: i386
Date: Wed Oct 15 20:52:56 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1413398414
 com.ubuntu.update-manager window-height 500
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu-Studio 10.04 LTS "Lucid Lynx" - Release i386 (20100427.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2014-10-15 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: apport-bug dist-upgrade i386 precise

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https://bugs.launchpad.net/bugs/1381698

Title:
  upgrade from 12.04 to 14.04 crashes

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

Bug description:
  During the upgrade from 12.04 to 14.04.01 this  message appeared:

  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

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-69.103-generic 3.2.62
  Uname: Linux 3.2.0-69-generic i686
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: i386
  Date: Wed Oct 15 20:52:56 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1413398414
   com.ubuntu.update-manager window-height 500
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu-Studio 10.04 LTS "Lucid Lynx" - Release i386 (20100427.1)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-10-15 (0 days ago)
  VarLogDistupgradeTermlog:

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