[Bug 1536646] Re: When requesting upgrade of distribution finds unresolvable problem

[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/1536646

Title:
  When requesting upgrade of distribution finds unresolvable problem

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

Bug description:
  When upgrading from Trusty 14.04 to Vivid 15.04, installation only
  gets so far and:

  Could not determine 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 

  15.04 is not a pre-release, and there are too many packages to go
  through to find which are not provided by ubuntu.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-77.121-generic 3.13.11-ckt32
  Uname: Linux 3.13.0-77-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Jan 21 14:00:54 2016
  InstallationDate: Installed on 2014-07-20 (549 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  SystemImageInfo: Error: [Errno 2] No such file or directory: 'system-image-cli'
  UpgradeStatus: Upgraded to trusty on 2016-01-21 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-20T15:34:31.495656

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