[Bug 1520458] [NEW] "Can't upgrade from ubuntu 14.10 to 15.04

[David]

Public bug reported:

Upon trying to use the updater to update from ubuntu 14.10 to 15.04 I
received the following error. This is a relatively clean ubuntu
installation so I'm not really sure what went wrong. I got the following
error multiple times.


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 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-70.113-generic 3.13.11-ckt29
Uname: Linux 3.13.0-70-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Nov 27 02:30:04 2015
InstallationDate: Installed on 2014-06-09 (536 days ago)
InstallationMedia: It
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2015-11-27 (0 days ago)
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update.manager.release.upgrades: 2015-11-27T00:21:34.404918

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


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

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https://bugs.launchpad.net/bugs/1520458

Title:
  "Can't upgrade from ubuntu 14.10 to 15.04

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

Bug description:
  Upon trying to use the updater to update from ubuntu 14.10 to 15.04 I
  received the following error. This is a relatively clean ubuntu
  installation so I'm not really sure what went wrong. I got the
  following error multiple times.


  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 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-70.113-generic 3.13.11-ckt29
  Uname: Linux 3.13.0-70-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Nov 27 02:30:04 2015
  InstallationDate: Installed on 2014-06-09 (536 days ago)
  InstallationMedia: It
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2015-11-27 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2015-11-27T00:21:34.404918

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