This was also encountered while attempting to upgrade from 10.10->11.04, however removing xserver-xorg-video-nouveau did not solve the problem.
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/775289
This was also encountered while attempting to upgrade from 10.10->11.04, however removing xserver- xorg-video- nouveau did not solve the problem.
https:/ /bugs.launchpad .net/ubuntu/ +source/ update- manager/ +bug/775289