[Bug 1365540] Re: WIll not upgrade from 12.04 to 14.04

[robin]

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

** This bug is no longer a duplicate of bug 1357948
   Could not calculate the upgrade
** This bug has been marked a duplicate of bug 1361496
   With the Upgrading Ubuntu 12.04 64bit on 14.04 there comes mistake: It could not be determined which system actualizations are available

** This bug is no longer a duplicate of bug 1364927
   Cannot upgrade from 12.04 to 14.04
** This bug has been marked a duplicate of bug 1361385
   dist-upgrade to 14.04 failed

** This bug is no longer a duplicate of bug 1361385
   dist-upgrade to 14.04 failed
** This bug has been marked a duplicate of bug 1357948
   Could not calculate the upgrade

** This bug is no longer a duplicate of bug 1361496
   With the Upgrading Ubuntu 12.04 64bit on 14.04 there comes mistake: It could not be determined which system actualizations are available
** This bug has been marked a duplicate of bug 1362725
   trying to update from 12.04 to 14.04 and it crashes

** This bug is no longer a duplicate of bug 1362725
   trying to update from 12.04 to 14.04 and it crashes
** 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/1365540

Title:
  WIll not upgrade from 12.04 to 14.04

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

Bug description:
  When trying to upgrade from 12.04 to 14.04 I get this message:

  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 

  
  However none of the causes seem to apply.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.13.0-35.62~precise1-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: amd64
  Date: Thu Sep  4 16:39:00 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1409841233
   com.ubuntu.update-manager window-height 518
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  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 2014-09-04 (0 days ago)

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