xubuntu 11.10 to 12.04 upgrade

[Juga Paazmaya]

Trying to upgrade the distro via graphical update manager and after prosessing the source lists, it crashes with the message:

Could not determine the upgrade

An unresolvable problem occurred while calculating the upgrade:
E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

 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 update-manager' in a terminal.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: update-manager 1:0.152.25.9
ProcVersionSignature: Ubuntu 3.0.0-19.33-generic 3.0.27
Uname: Linux 3.0.0-19-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sat May 12 00:17:09 2012
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110426)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to oneiric on 2012-05-11 (0 days ago)

[Fabio Marconi (fabiomarconi)]

Please run in terminal
sudo apt-get clean
sudo apt-get autoclean
sudo apt-get dist-upgrade
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[Juga Paazmaya (olavic)]

Thank you for the commands.
After running those, followed starting the graphical update manager for distro upgrade, it failed with the same dialog as it did before.

Would you like me to attach those files again?

[Launchpad Janitor (janitor)]

[Expired for update-manager (Ubuntu) because there has been no activity for 60 days.]