Public bug reported:
Tried today to upgrade from 12.04.5 LTS to 14.04.1 LTS.
First try resulted in errors with ubuntu-desktop package, which wasn't
installed. I installed it manually, and now this error message occurs:
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
Cannot upgrade from 12.04 to 14.04 now.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.17
ProcVersionSignature: Ubuntu 3.2.0-75.110-generic 3.2.64
Uname: Linux 3.2.0-75-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
Date: Tue Jan 27 11:42:43 2015
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2015-01-27 (0 days ago)
** Affects: update-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade precise running-unity
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https://bugs.launchpad.net/bugs/1414987
Title:
Upgrading from 12.04.5 LTS to 14.04.1 LTS reports unresolvable issues
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