Comment 2 for bug 544012

None of your attached logs actually show a crash. From your description it sounds like you have an issue booting rather than a crash, so I've updated the bug report accordingly.

It would be helpful if you could elaborate a bit more on your description - details might matter! Also if you're certain that X is crashing, what we will need is a full backtrace. See http://wiki.ubuntu.com/X/Backtracing for guidance on gathering this.