Upgrade to 11.10 fails multiple times

[Maarten van den Berg]

When I try to upgrade to Ubuntu 11.10 (from 11.04) I get an error message:

An unresolvable problem occurred while calculating the upgrade:
E:Fout, pkgProblemResolver::Resolve maakte scheidingen aan, dit kan veroorzaakt worden door vastgehouden pakketten.
(Dutch)
 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.

I think this is caused by a failed upgrade to the pre-release beta 2, when my power failed. After that, I got this error every time when OI tried to update to a pre-release / 11.10 release.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.3
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic i686
NonfreeKernelModules: fglrx
Architecture: i386
Date: Thu Oct 13 18:06:46 2011
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /apps/update-manager/window_size=(1024,743)
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=nl_NL:en
 PATH=(custom, user)
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-10-13 (0 days ago)

[dino99 (9d9)]

That version is no more maintained