Public bug reported:
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
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.3
ProcVersionSignature: Ubuntu 3.19.0-51.57-generic 3.19.8-ckt13
Uname: Linux 3.19.0-51-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.8
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Feb 22 23:04:39 2016
InstallationDate: Installed on 2013-12-28 (787 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to vivid on 2016-02-23 (0 days ago)
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade third-party-packages vivid
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https://bugs.launchpad.net/bugs/1548605
Title:
Unresolvable problem with upgrading from 15.04 to 15.10
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