[Bug 1246441] Re: do-release-upgrade fails with "Could not calculate the upgrade"

[Rich Stillman]

I followed instructions and removed all ppas using add-apt-repository
--remove followed by ppa-purge. Nothing changed in the flow of do-
release-upgrade.

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https://bugs.launchpad.net/bugs/1246441

Title:
  do-release-upgrade fails with "Could not calculate the upgrade"

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

Bug description:
  Could not calculate 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.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: ubuntu-release-upgrader-core 1:0.192.13
  ProcVersionSignature: Ubuntu 3.8.0-32.47-generic 3.8.13.10
  Uname: Linux 3.8.0-32-generic i686
  ApportVersion: 2.9.2-0ubuntu8.5
  Architecture: i386
  CheckboxSubmission: c3bdf3cb22c4bd8acbc2616fa3f80669
  CheckboxSystem: edda5d4f616ca792bf437989cb597002
  CrashDB: ubuntu
  Date: Wed Oct 30 23:59:27 2013
  InstallationDate: Installed on 2012-10-20 (375 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to raring on 2013-10-30 (0 days ago)
  VarLogDistupgradeTermlog:

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