[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

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/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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