[Bug 1448007] Re: I can not upgrade from Ubuntu 14.10 to 15.04

[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/1448007

Title:
  I can not upgrade from Ubuntu 14.10 to 15.04

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

Bug description:
  I am using Ubuntu 14.10, with ubuntu-release-upgrader-core 1:14.10.10.

  When I tried to upgrade to Ubuntu 15.04 with the Software Updater, I
  encountered this error:

  '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.'

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  ProcVersionSignature: Ubuntu 3.16.0-36.48-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-36-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 24 19:28:36 2015
  InstallationDate: Installed on 2014-10-22 (184 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-04-24 (0 days ago)
  VarLogDistupgradeTermlog:

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