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I get that error message from time to time while working in Ubuntu (after updates I think).

I can force that error simply by going to terminal and executing:

unity --reset

Even with this error I can use the desktop normally, but not 3d.

I think this happened since I started using dual screen; since then I can't use unity 3d.

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What drivers do you have installed? What graphic card is yours? It seems like you don't have full use of your graphic card, and need 3d support to run Unity without problems – LnxSlck Jul 4 '12 at 13:51
I am using Nvidea GeForce 9500. And the drivers are form nvidia's site, the drivers are version 295.40 – quinestor Jul 10 '12 at 11:53

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