X doesn't start after update on Ubuntu 12.04.3 LTS

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http://www.linuxquestions.org – Hi! I faced the following problem today after updating the system (it has been a while since I last updated it): the update manager popped up and I decide to apply the changes, for as I said above, it has been some time since the last update. After it ended downloading all the packages, there was a request to reboot the system in order apply the changes. Thus, the PC restarted, but the desktop environment did not show up. I've tried booting on an older version of the kernel and even in the safe mode it happened nothing. When booting I attempted to see the booting messages and they stopped at t (HowTos)