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I installed ubuntu 13.10 in dual boot successfully, but after having updated my nvidia driver with apt-get, I can no longer sign in into my account, and after each authentification, the login screen is returning the same login screen.

And the worst is that i'm unable to open vitual terminal with ctrl-Alt-F1 to solve the problem in commend line as described here.

Simply because all TTYs (Ctrl-Alt-F[1-6]) are nor working anymore.

I was thinking if the problem might be solved using grub command or something, but I have no idea how to proceed.

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I was also thinking to boot from an Ubuntu USB live disk to delete the .Xauthority file. But how can I have access/edit to my ubuntu partition files from USB live? Thanks – Madhatter Mar 6 '14 at 16:03

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