[Bug 1608697] Re: Upgrade from 14.04 to 16.04 fails

[Brian Murray]

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

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains package version numbers greater than the release to which
you are upgrading. You can revert the PPA by installing the ppa-purge
package from the official Ubuntu archive and then running 'sudo ppa-
purge oibaf'.  After that you try upgrading and again and if it still
fails open a new bug report.  Thanks and good luck!

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

** Tags added: ppa xorg-oibaf-ppa

** 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/1608697

Title:
  Upgrade from 14.04 to 16.04 fails

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

Bug description:
  Here are the results of the commands thereunder :

  jean-luc at E-4300:~$ lsb_release -rd
  Description:	Ubuntu 14.04.4 LTS
  Release:	14.04
  jean-luc at E-4300:~$ apt-cache policy pkgname
  N: Impossible de trouver le paquet pkgname
  jean-luc at E-4300:~$

  Contents of /var/log/dist-upgrade/ in attachment.

  The error occurs during the repository configuration phase with the error box :
  -------------------------------------------- Start ---------------------------------------------------
  Impossible d'évaluer la mise à niveau

  Un problème insoluble est survenu lors de la préparation de la mise à
  niveau.

   Ceci peut-être dû à :
   * la mise à niveau vers une version de développement d'Ubuntu ;
   * la version de développement d'Ubuntu est actuellement utilisée ;
   * des paquets logiciels non officiels, non fournis par Ubuntu.

  Si rien de tout cela ne s'applique, veuillez signaler ce bogue en utilisant la commande « ubuntu-bug ubuntu-release-upgrader-core » dans un terminal.
  --------------------------------------------- End ----------------------------------------------------

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-92.139-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-92-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Aug  1 23:16:28 2016
  InstallationDate: Installed on 2015-10-03 (303 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-01 (0 days ago)
  VarLogDistupgradeTermlog:

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