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On Ubuntu 12, I can't access system, it stays stuck on lightdm.

From tty, giving startx, I receive this message:

ddxSigGiveUp: Closing log
Invalid MIT-MAGIC-COOKIE-1 key
Invalid MIT-MAGIC-COOKIE-1 key
xinit: giving up
xinit: unable to connect to server
X: Resource temporarily unavailable
xinit: server error

What can I do??

Thank you

share|improve this question
Try the answers from this post on AU: – Peachy Oct 6 '12 at 16:15

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