If you get a black
screen after rebooting in to a freshly installed Ubuntu 14.04, it is
a problem with compatibility of video drivers and modes. To
permanantly fix this,
Get to the grub menu
at boot time by pressing right shift.
Select the first
option and press e to edit.
At the end of the
line starting with linux add nomodeset and boot.
Then open the
/etc/default/grub file and add this line.
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset
vga=791"
close the file and
run following commands.
grub-mkconfig
update-grub
