[Bug 1458177] Re: Upgrading from 14.10 to 15.04 - could not calculate the upgrade

[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/1458177

Title:
  Upgrading from 14.10 to 15.04 - could not calculate the upgrade

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

Bug description:
  My prev. Bug report
   [Bug 1458145] Re: Upgrading from 14.10 to 15.04 - could not calculate the upgrade

  *** 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
  the xorg-edgers-ppa.  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.  Thanks.

  
  So I removed the xorg-edgers with

  > sudo ppa-purge xorg-edgers

  Restarted the upgrade, same warning again.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  ProcVersionSignature: Ubuntu 3.16.0-38.52-generic 3.16.7-ckt10
  Uname: Linux 3.16.0-38-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.7-0ubuntu8.5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat May 23 15:56:09 2015
  InstallationDate: Installed on 2014-04-23 (394 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-05-23 (0 days ago)
  VarLogDistupgradeTermlog:

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