It happend to me on precise after: install linux-generic-lts-saucy a xserver-xorg-lts-saucy and and use ubuntu tweak janitor Helps: sudo dpkg-reconfigure -phigh xserver-xorg-lts-saucy
It happend to me on precise after: lts-saucy a xserver- xorg-lts- saucy and xorg-lts- saucy
install linux-generic-
and use ubuntu tweak janitor
Helps:
sudo dpkg-reconfigure -phigh xserver-