[Bug 1338389] [NEW] I can not upgrade my ubuntu version to "12:04" to version "14:04"

[leonardo da Silva Vicente]

Public bug reported:

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 1:0.156.14.13
ProcVersionSignature: Ubuntu 3.5.0-52.79~precise1-generic 3.5.7.33
Uname: Linux 3.5.0-52-generic i686
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Sun Jul  6 22:00:15 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1404694055
 com.ubuntu.update-manager window-height 501
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2014-07-07 (0 days ago)

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


** Tags: apport-bug dist-upgrade i386 precise running-unity third-party-packages

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https://bugs.launchpad.net/bugs/1338389

Title:
  I can not upgrade my ubuntu version to "12:04" to version "14:04"

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

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

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.13
  ProcVersionSignature: Ubuntu 3.5.0-52.79~precise1-generic 3.5.7.33
  Uname: Linux 3.5.0-52-generic i686
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  Date: Sun Jul  6 22:00:15 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1404694055
   com.ubuntu.update-manager window-height 501
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-07-07 (0 days ago)

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