A few days ago I upgraded my old desktop computer from xubuntu 12.04 to 14.04. I did it online when the option to upgrade appeared on my screen. So, I proceede to upgrade, but when I rebooted the computer to start the 14.04 it all went black. I have no vga display at all, although it seems it is all working fine. If I press the turn off buttom, I can hear it is shutting down and it shuts down after a few seconds. So, it appears the problem is the vga output. Since I cannot see anything at all, and obviously cannot perform anything, is there a way a can return to 12.04 without having to erase everything on my hard-drive? I would not mind staying in 14.04, but if there is not way to do it then I need to get back to 12.04. Any help is greatly appreciated.
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