[Bug 1577069] Re: upgrade from 14.04 LTS failed

[Ubuntu Foundations Team Bug Bot]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1069133, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug.  Additionally, any further discussion regarding the bug should occur in the other report.  Please continue to report any other bugs you may find.
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** This bug has been marked a duplicate of bug 1069133
   Get upgrade error 12.04 - 12.10 "Could not determine upgrade" - xorg from ppa

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https://bugs.launchpad.net/bugs/1577069

Title:
  upgrade from 14.04 LTS failed

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

Bug description:
  I set the Notify me of a new Ubuntu version to any new version, run the upgrade tool and was expecting to be prompted to upgrade to 16.04. Instead i was prompted to upgrade to version 15.
  When i run the tool it failed indicating that one of my upgrade package files had been modified??
  Sorry i can't be of anymore help than this.
  I'm running 14.04 LTS

  apt-cache policy pkgname
  shows
  N: Unable to locate package pkgname

  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
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun May  1 11:28:20 2016
  InstallationDate: Installed on 2014-04-28 (733 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-04-30 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2016-05-01T10:48:19.608959

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