Thanks for reporting this bug and help to make Ubuntu better.
at restart, it means that you have a driver which doesn't support 3D,
this is why you see such a diaog.
What driver do you use, can you paste the result of lspci command there,
please?
** Changed in: unity (Ubuntu)
Status: New => Incomplete
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Unity doesn't start after reboot
https://bugs.launchpad.net/bugs/654347
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