[Bug 1468975] [NEW] Cannot upgrade to 15.04 from 14.10

[chaicko]

Public bug reported:

Just failing to upgrade from utopic  to vivid using the update-manager,
as indicated in the recommended process for upgrade. The update-manager
fails right after the "Setting New software channels" step finishes. I
updated and upgraded all packages before attempting the upgrade. The
error message is:

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 14.10
Package: ubuntu-release-upgrader-core 1:14.10.10
Uname: Linux 3.17.0-custom x86_64
ApportVersion: 2.14.7-0ubuntu8.5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu Jun 25 22:54:40 2015
InstallationDate: Installed on 2014-08-16 (313 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to utopic on 2015-06-26 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade utopic

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https://bugs.launchpad.net/bugs/1468975

Title:
  Cannot upgrade to 15.04 from 14.10

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

Bug description:
  Just failing to upgrade from utopic  to vivid using the update-
  manager, as indicated in the recommended process for upgrade. The
  update-manager fails right after the "Setting New software channels"
  step finishes. I updated and upgraded all packages before attempting
  the upgrade. The error message is:

  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 14.10
  Package: ubuntu-release-upgrader-core 1:14.10.10
  Uname: Linux 3.17.0-custom x86_64
  ApportVersion: 2.14.7-0ubuntu8.5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Jun 25 22:54:40 2015
  InstallationDate: Installed on 2014-08-16 (313 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to utopic on 2015-06-26 (0 days ago)
  VarLogDistupgradeTermlog:

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