When I try to confirm than I can run Unity 3D on my Asus U31SD with intel's i5 Sandy Brigde and Nvidia 520 and Nvidia Optimus I receive this error:
Xlib: extension "GLX" missing on display ":0".
Of course, I cannot run any of the effects of Ubuntu 11.10, not even the simple app switcher.
Can anybody help me? Thank you