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I was using ubuntu 12.04 perfectly im my desktop until last kernel update (3.2.0-51). After the update proccess and reboot the system, the unity inteface didn' t start. The only way to login in the system is by tty. I have tried the last kernel versions available in the computer, but I can't use the graphycal interface.

Until the text terminals is impossible to access the unity interface.

If I don't encounter a solution I will re-install the whole system.

Anybody can help me?

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Grub Menu > Advanced Options > choose an old kernel > boot to your desktop > sudo apt-get install -f ; sudo apt-get dist-upgrade > Restart – mini Aug 2 '13 at 16:22
Thanks, but I dont want upgrade my ubuntu version. I only use LTS versions, and in the old versions of kernel I cant access my desktop. After enter my password the system backs to the login screen. Its possible to use the guest account, but my account seem blocked. – leobap Aug 2 '13 at 22:43
dist-upgrade won't upgrade the Ubuntu version. To upgrade your version you should enter this command: do-release-upgrade. dist-upgrade will upgrade your kernel. Howeve, glad you solved your problem. – mini Aug 3 '13 at 5:30

The link below solved my problem.

Blank screen after installing nvidia restricted driver

It was a graphic driver problem.

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