[Bug 1361385] Re: dist-upgrade to 14.04 failed

[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/1361385

Title:
  dist-upgrade to 14.04 failed

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.

  
  Even after
  sudo apt-get clean
  sudo apt-get autoremove
  sudo apt-get update
  sudo apt-get upgrade
  sudo apt-get dist-upgrade

  the problem still appears-

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.5.0-54.81~precise1-generic 3.5.7.33
  Uname: Linux 3.5.0-54-generic i686
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  Date: Mon Aug 25 23:34:26 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1409002404
   com.ubuntu.update-manager window-height 500
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04 "Precise" - Build i386 LIVE Binary 20130822-17:25
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-08-25 (0 days ago)
  VarLogDistupgradeTermlog:

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