Update from Maverick to Narwhal fails

Here's the latest failure but its not clear to me what it says:

2011-10-10 17:17:59,703 DEBUG quirks: running nattyPostDistUpgradeCache
2011-10-10 17:17:59,856 DEBUG Marking 'ubuntu-desktop' for upgrade
2011-10-10 17:19:02,650 DEBUG Can't mark 'ubuntu-desktop' for upgrade (E:Probleme können nicht korrigiert werden, Sie haben gehaltene defekte Pakete.)
2011-10-10 17:19:42,197 ERROR Dist-upgrade failed: 'Das Paket »ubuntu-desktop« konnte nicht zum Aktualisieren vorgemerkt werden'
2011-10-10 17:19:42,198 DEBUG abort called

The translation is:

E:Problems couldn't be resolved, you have holden, broken packages
The paket »ubuntu-desktop« couldn't be marked for upgrade.

I guess, my question now is:
How to figure out which paket(s) are HOLD and BROKEN which »ubuntu-desktop«
depends on?

It looks like the issue is something releated to webkit:

Investigating (2) libwebkitgtk-1.0-common [ i386 ] < none -> 1.3.13-0ubuntu2 > ( libs )
Broken libwebkitgtk-1.0-common:i386 Kollidiert mit on libwebkit-1.0-common [ i386 ] < 1.2.7-0ubuntu0.10.10.1 > ( libs )
  Considering libwebkit-1.0-common:i386 9 as a solution to libwebkitgtk-1.0-common:i386 3
  Holding Back libwebkitgtk-1.0-common:i386 rather than change

Could you please try removing libwebkit-1.0-common and see if the upgrade works then? This will also remove some package that the upgrade should put back in. But to be sure, please write down the list of packages and if the upgrader does not put them back install them manually (sorry for that).

It worked, the bug can be marked as solved, many thanks for your help, Malte