Upgrading ubuntu 10.10 to natty narwhal

youri@zexlette:~$ sudo do-release-upgrade -d

This hangs at "Calculating the changes"

youri@zexlette:~$ sudo aptitude update

youri@zexlette:~$ sudo aptitude full-upgrade

1164 packages upgraded, 135 newly installed, 78 to remove and 0 not upgraded.
Need to get 623MB of archives. After unpacking 3,940kB will be freed.

E: Couldn't configure pre-depend x11-common for x11-utils, probably a dependency cycle.

youri@zexlette:~$ sudo dpkg --force-depends --remove x11-xkb-utils
[source]

youri@zexlette:~$ sudo aptitude full-upgrade