[Bug 1574366] Re: system upgrade it might not be possible with some packages

[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 different versions of packages essential to Ubuntu.  The
page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details
on to how to revert to the official Xorg packages for the xorg-edgers
PPA.  Instructions for reverting to official Xorg packages should be
similar for the PPA that you have enabled.

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

** Tags added: ppa xorg-edgers-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/1574366

Title:
  system upgrade it might not be possible with some packages

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

Bug description:
  The update failed Preparation

  Unsolvable problem occurred during the update.

  This could have been caused as follows:
  * Updates to Ubuntu a pre-release version
  * To run the Ubuntu version of a pre-release
  * Unofficial packages that are not in the Ubuntu provides

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic i686
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Apr 24 21:07:16 2016
  InstallationDate: Installed on 2011-10-26 (1641 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-04-24 (0 days ago)

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