[Bug 1371431] Re: The system has asked permission to upgrade to ubuntu 14.4 version but then shows an error which says Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade.

[Brian Murray]

*** This bug is a duplicate of bug 1308338 ***
    https://bugs.launchpad.net/bugs/1308338

** This bug has been marked a duplicate of bug 1308338
   Ubuntu 12.04 LTS -> 14.04 LTS upgrade fails if Flight Gear installed

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https://bugs.launchpad.net/bugs/1371431

Title:
  The system has asked permission to upgrade to ubuntu 14.4 version but
  then shows an error which says Could not calculate the upgrade  An
  unresolvable problem occurred while calculating the upgrade.

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

Bug description:
  The system has asked permission to upgrade to ubuntu 14.4 version but
  then shows an error which says Could not calculate the upgrade  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.

  I am currently using Ubuntu 12.04 LTS

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-68.102-generic 3.2.62
  Uname: Linux 3.2.0-68-generic i686
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: i386
  Date: Fri Sep 19 10:09:03 2014
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  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 2014-09-19 (0 days ago)
  VarLogDistupgradeTermlog:

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