In the new Ubuntu 9.04 Jaunty Jackalope, Intel graphic (video) drivers 965 (x3000 or x3100) are blacklisted so you cannot run Compiz thus your desktop effects cannot be enabled. There is a way to enable desktop effects, though this is not recommended because the drivers were blacklisted due to
an error in xserver-xorg-video-intel and they will be whitelisted when the bug fill be fixed.
But if you want to use Compiz anyway, all you have to do is type this in a terminal:
mkdir -p ~/.config/compiz/ && echo SKIP_CHECKS=yes >> ~/.config/compiz/compiz-manager
Update 05 May 2009:
It seems that some Intel cards now work in Ubuntu Jaunty, after the latest updates.
Update 09 May 2009: You may also want to check out the
Ubuntu graphic drivers repository.
