[Bug 1681514] Re: I'm unable to upgrade to Ubuntu 16.04 from 14.04.

[Brian Murray]

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

** This bug is no longer a duplicate of bug 1682909
   Cannot upgrade Xubuntu from 16.10 to 17.04
** 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/1681514

Title:
  I'm unable to upgrade to Ubuntu 16.04 from 14.04.

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

Bug description:
  After trying to upgrade from the terminal, it reports:

  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.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.9
  ProcVersionSignature: Ubuntu 3.13.0-117.164-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-117-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Apr 10 17:50:57 2017
  InstallationDate: Installed on 2014-08-09 (974 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_NG:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_NG
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2017-04-10 (0 days ago)

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