Comment 3 for bug 140534

kseise:
Your guess is almost certainly right. You are using an NVIDIA card (the only question could be whether it's a card newer than a GeForce 2 but I think it's safe to assume that your card is a GeForce 2MX or newer if you can use compiz-fusion and you are seeing this problem), you only get the crashes when desktop effects are on, you are using Gutsy and the crashes restart X. Given all of information I will mark this bug a duplicate.

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #130325, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can add, or to see if there is a workaround for the bug. Feel free to continue to report any other bugs you may find.