The log indicates that your system didn't have a driver for synaptics,
and that's where it failed. Configuration files were almost identical.
The reason why you didn't have synaptics anymore is a mystery to me, but
since I haven't seen similar issues open this is most likely fixed by
now.
If you can reproduce it with a newer version, feel free to reopen.
** Changed in: xorg (Ubuntu)
Status: Needs Info => Rejected
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ubuntu hoary to breezy fails to restart X
https://launchpad.net/bugs/22528
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