Cant run AC on Ubuntu 12.04

[debashisp]

I can play it on my laptop now but i still want to resolve the issue with my desktop. btw ^^ this is what i get

d@d-platform:~$ glxinfo | grep "string:"
server glx vendor string: SGI
server glx version string: 1.4
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel® G33 x86/MMX/SSE2
OpenGL version string: 1.4 Mesa 8.0.2