[Bug 1240996] [NEW] Error on Release Upgrade

[Wesley]

Public bug reported:

Trying to upgrade to 13.10 from 13.04, fetches packages and and then
bails and says:

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.

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 x86_64
ApportVersion: 2.9.2-0ubuntu8.4
Architecture: amd64
CrashDB: ubuntu
Date: Thu Oct 17 14:51:20 2013
InstallationDate: Installed on 2012-10-23 (358 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to raring on 2013-10-17 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade raring third-party-packages

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https://bugs.launchpad.net/bugs/1240996

Title:
  Error on Release Upgrade

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

Bug description:
  Trying to upgrade to 13.10 from 13.04, fetches packages and and then
  bails and says:

  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.

  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 x86_64
  ApportVersion: 2.9.2-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  Date: Thu Oct 17 14:51:20 2013
  InstallationDate: Installed on 2012-10-23 (358 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to raring on 2013-10-17 (0 days ago)

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