Did you try to remove xserver-xorg-xgl? Whereas Feisty needed that, Gutsy doesn't anymore, and xserver-xorg-video-intel is all that is needed (for intel video cards of course).
Did you try to remove xserver-xorg-xgl? Whereas Feisty needed that, Gutsy doesn't anymore, and xserver- xorg-video- intel is all that is needed (for intel video cards of course).