От линка който ми даде намерих
Ubuntu 12.04
With the default settings, Ubuntu 12.04 boots to either a black screen or or top half screen.
There are several potential solutions: console=tty1, disable splash, or 915 Resolution
Option 1 - console=tty1
Perhaps the easiest method is to use "console=tty1" as a boot option.
gksudo gedit /etc/default/grub
Find the following line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Add console=tty1 in between the quotes, the end result looking as follows
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash console=tty1"
save and exit, then update grub with
sudo update-grub
проблема се реши

имаш една
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