[Bug 1453220] Re: Message "Can't install 'ubuntu-desktop'" during upgrade 14.10>15.04

[Ubuntu Foundations Team Bug Bot]

*** 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.

[This is an automated message.  I apologize if it reached you
inappropriately; please just reply to this message indicating so.]

** Tags added: ppa

** Tags added: xorg-edgers-ppa

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

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https://bugs.launchpad.net/bugs/1453220

Title:
  Message "Can't install 'ubuntu-desktop'" during upgrade 14.10>15.04

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

Bug description:
  OS version = Ubuntu 14.10
  package version = unsure, but it's the automatic Ubuntu updater in Ubuntu 14.10.
  Expected = no error.
  Actual = Ubuntu notified me that there's a new version available. I confirmed that I wanted to upgrade, and the window "Distribution Upgrade" started working:

  quote:
  Upgrading Ubuntu to version 15.04
  v Preparing to upgrade
  > Setting new software channels
  unquote.

  At this stage, an error was displayed:

  quote:
  Can't install 'ubuntu-desktop'

  It was impossible to install a required package. Please report this as
  a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  [OK]
  unquote.

  After clicking "OK" the installer seems to have continued okay anyway.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  ProcVersionSignature: Ubuntu 3.16.0-37.51-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-37-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri May  8 19:16:31 2015
  InstallationDate: Installed on 2013-08-27 (618 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-05-08 (0 days ago)
  VarLogDistupgradeTermlog:

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