[Bug 1348255] Re: Can 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 has been marked a duplicate of bug 1357948
   Could not calculate the upgrade

** 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 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/1348255

Title:
  Can not upgrade from 12.04 to 14.04

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

Bug description:
  When using upgrade manager to update to Ubuntu `14.04, it fails saying "could not determine the upgrade", citing an unrecoverable problem when calculating the upgrade. E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
   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 u...

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.15
  ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Thu Jul 24 23:16:44 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1406218176
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 604
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
  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 2014-07-24 (0 days ago)
  VarLogDistupgradeTermlog:

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