[Bug 1530417] [NEW] can't upgrade from 14.04 to 15.04

[Jedidjah de Vries]

Public bug reported:

Running do-release-upgrade gives

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

But none of those causes are applicable.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Thu Dec 31 23:09:57 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2001-01-01 (5477 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-01 (0 days ago)
mtime.conffile..etc.update.manager.release.upgrades: 2015-12-31T22:52:58.498299

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


** Tags: apport-bug dist-upgrade i386 trusty

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https://bugs.launchpad.net/bugs/1530417

Title:
  can't upgrade from 14.04 to 15.04

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

Bug description:
  Running do-release-upgrade gives

  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

  But none of those causes are applicable.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Thu Dec 31 23:09:57 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2001-01-01 (5477 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-01 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2015-12-31T22:52:58.498299

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