[Bug 1518573] [NEW] Failed to upgrade from 14.04 to 15.04

[Paul]

Public bug reported:

The release upgrade fails with the following message.

---
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 
--

Detailed logs attached.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
Uname: Linux 4.2.3-040203-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Nov 21 15:28:39 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-12-10 (346 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2015-11-21 (0 days ago)
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update.manager.release.upgrades: 2015-11-21T15:10:16.895504

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


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

-- 
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Ubuntu.
https://bugs.launchpad.net/bugs/1518573

Title:
  Failed to upgrade from 14.04 to 15.04

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

Bug description:
  The release upgrade fails with the following message.

  ---
  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 
  --

  Detailed logs attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  Uname: Linux 4.2.3-040203-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Nov 21 15:28:39 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-12-10 (346 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2015-11-21 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2015-11-21T15:10:16.895504

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