cannot upgrade Ubuntu 10.04 to 10.10

[some_birdie]

Binary package hint: update-manager

My steps:
1. Installed Ubuntu 9.10 from installation CD.
2. Successfully upgraded to 10.04 with update-manager.
3. Tried to upgrade to 10.10 with update-manager.

Result: On "Setting new software channels" step error message occures: "An unresolvable problem occurred while calculating the upgrade: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages." etc.

Log files from "/var/log/dist-upgrade/" are in attachment.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.11
ProcVersionSignature: Ubuntu 2.6.32-28.55-generic 2.6.32.27+drm33.12
Uname: Linux 2.6.32-28-generic i686
Architecture: i386
Date: Thu Feb 10 22:33:25 2011
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: update-manager

[some_birdie (some-birdie)]

Sorry, I've found this: https://answers.launchpad.net/update-manager/+question/143821 and "sudo apt-get remove xserver-xorg-video-nouveau" helped.

[RedSingularity (redsingularity)]

Yes, this is a duplicate of bug 645064. Marking.