[Bug 1551625] [NEW] can't upgrade version 12.04 to 14.04

[benez9]

Public bug reported:

update manager unables to upgrade to 14.04 from 12.04

the message is 
* 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 1:0.156.14.19
ProcVersionSignature: Ubuntu 3.13.0-79.123~precise1-generic 3.13.11-ckt33
Uname: Linux 3.13.0-79-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.13
Architecture: amd64
Date: Tue Mar  1 09:49:27 2016
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
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 2016-03-01 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade precise third-party-packages

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https://bugs.launchpad.net/bugs/1551625

Title:
  can't upgrade version 12.04 to 14.04

Status in update-manager package in Ubuntu:
  New

Bug description:
  update manager unables to upgrade to 14.04 from 12.04

  the message is 
  * 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 1:0.156.14.19
  ProcVersionSignature: Ubuntu 3.13.0-79.123~precise1-generic 3.13.11-ckt33
  Uname: Linux 3.13.0-79-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.13
  Architecture: amd64
  Date: Tue Mar  1 09:49:27 2016
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
  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 2016-03-01 (0 days ago)
  VarLogDistupgradeTermlog:

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