[Bug 1583922] Re: can't upgrade from ubuntu 14.04 to 16.04

[autorunc]

** Information type changed from Public to Public Security

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https://bugs.launchpad.net/bugs/1583922

Title:
  can't upgrade from  ubuntu 14.04 to 16.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  * Iam using : Ubuntu 14.04.4 LTS , and want to upgrade to 16.04 LTS

  *  version of the package 13.10

  * the message  iam getting after using the command sudo do-release-
  upgrade

  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. 

  
  Restoring original system state

  Aborting

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-85.129-generic 3.13.11-ckt36
  Uname: Linux 3.13.0-85-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri May 20 12:07:14 2016
  InstallationDate: Installed on 2012-05-18 (1463 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-05-20 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2016-05-20T11:41:34.684379

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