Just upgraded my Ubuntu partition to Lucid Lynx today. Every thing installed fine but after every thing was done and I rebooted I noticed desktop effects in compiz were disabled. So I thought to myself I know they worked before the upgrade. Then I started digging and I came upon an entry in the Xorg log that said “Failed to initialize GLX extension (Compatible NVIDIA X driver not found)”. The Nvidia part was the tipoff , since I have an ATI card. So I did some more digging on the Internet and I came across this page Desktop effects will not activate in Lucid Lynx. On page 3 it said to remove all packages related to Nvidia. So I did â€œsudo apt-get –purge remove nvidia*â€ Iâ€™m still not sure how nvidia drivers got in the system during the upgrade but after I rebooted everything was fine.