[Bug 1406740] Re: Failed when trying to upgrade from 14.04 to 14.10 with "Could not determine the upgrade"

[Brian Murray]

*** This bug is a duplicate of bug 996916 ***
    https://bugs.launchpad.net/bugs/996916

** This bug has been marked a duplicate of bug 996916
   postgresql packages in the removal blacklist making it hard to upgrade

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https://bugs.launchpad.net/bugs/1406740

Title:
  Failed when trying to upgrade from 14.04 to 14.10 with "Could not
  determine the upgrade"

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

Bug description:
  I ran the software updater and then chose to upgrade to 14.10.  I'm on
  14.04.

  During the "Setting new software channels" step I get an information
  dialog that:

  "Third party sources disabled

  Some third party entries in your sources.list were disabled. You can
  re-enable them after the upgrade with the 'software-properties' tool
  or your package manager."

  The upgrade seems to continue okay after that for a while, but then
  (still in the "Setting new software channels" step) I'm told that:

  "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

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

  I haven't upgraded to a pre-release version of Ubuntu, nor am I
  running the current pre-release version of Ubuntu.  I'm sure I've got
  all sorts of unofficial software packages installed, but I'd need the
  installer to give me some more information about what's caused the
  problem before I'm going to go digging around looking for the culprit
  :-)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.6
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Dec 31 09:59:28 2014
  InstallationDate: Installed on 2012-11-24 (766 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2014-12-31 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2014-10-28T22:02:09.340817

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