Hi,
If you're on a 64bits system, are you sure you're using the 64bit nvidia drivers?
If you're on a 64bits multilib system and atempt to run a 32bit binary using opengl (exemple : Cedega), are you sure you have installed the 32bits required librairies? I don't know how it works with Ubuntu but with Gentoo, there's a package for this : "app-emulation/emul-linux-x86-xlibs-20080316".
Hope this helps
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