[Bug 1448007] [NEW] I can not upgrade from Ubuntu 14.10 to 15.04

[Brett]

Public bug reported:

I am using Ubuntu 14.10, with ubuntu-release-upgrader-core 1:14.10.10.

When I tried to upgrade to Ubuntu 15.04 with the Software Updater, I
encountered this error:

'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
ProcVersionSignature: Ubuntu 3.16.0-36.48-generic 3.16.7-ckt9
Uname: Linux 3.16.0-36-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.4
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Apr 24 19:28:36 2015
InstallationDate: Installed on 2014-10-22 (184 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 2015-04-24 (0 days ago)
VarLogDistupgradeTermlog:

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


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

** Description changed:

- I am using Ubuntu 14.10, with ubuntu-release-upgrader 1:14.10.10.
+ I am using Ubuntu 14.10, with ubuntu-release-upgrader-core 1:14.10.10.
  
  When I tried to upgrade to Ubuntu 15.04 with the Software Updater, I
  encountered this error:
  
  '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
  ProcVersionSignature: Ubuntu 3.16.0-36.48-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-36-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 24 19:28:36 2015
  InstallationDate: Installed on 2014-10-22 (184 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 2015-04-24 (0 days ago)
  VarLogDistupgradeTermlog:

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1448007

Title:
  I can not upgrade from Ubuntu 14.10 to 15.04

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

Bug description:
  I am using Ubuntu 14.10, with ubuntu-release-upgrader-core 1:14.10.10.

  When I tried to upgrade to Ubuntu 15.04 with the Software Updater, I
  encountered this error:

  '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
  ProcVersionSignature: Ubuntu 3.16.0-36.48-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-36-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 24 19:28:36 2015
  InstallationDate: Installed on 2014-10-22 (184 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 2015-04-24 (0 days ago)
  VarLogDistupgradeTermlog:

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