Try booting ubuntu with the safe graphics option. If you cannot find
that, boot normally then push control alt f1, to get to a terminal.
After doing that use an editor like nano to edit (nano)
/etc/X11/xorg.conf and under
(command sudo nano /etc/X11/xorg.conf to edit this file).
Section "Device"
put Driver "vesa"
so it will now look like:
Section "Device"
Driver "vesa"
EndSection
After you do this type sudo /etc/init.d/gdm stop then type sudo
/etc/init.d/gdm start
Hopefully this will work for you.
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