update to 11.10 fails due to unspecified dependency issues

[Zdenek Precek]

An unresolvable problem occurred while calculating the upgrade:
E:Chyba, pkgProblemResolver::Resolve vytváří poruchy, to může být způsobeno podrženými balíky.

 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

No option out of the above three is true.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5
ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
Uname: Linux 2.6.38-12-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Thu Nov 3 22:44:12 2011
GConfNonDefault: /apps/update-manager/check_new_release_ignore=
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=cs_CZ:en
 PATH=(custom, no user)
 LANG=cs_CZ.utf8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-11-03 (0 days ago)
VarLogDistupgradeApttermlog:

VarLogDistupgradeHistorylog:

VarLogDistupgradeTermlog:

[dino99 (9d9)]

That version is no more maintained