Comment 19 for bug 1430587

Fixed :

- ppa-purge xorg-edgers

- removed all lts-utopic related packages through synaptic

- ran in terminal : sudo apt-get install --install-recommends linux-generic-lts-vivid xserver-xorg-core-lts-vivid xserver-xorg-lts-vivid xserver-xorg-video-all-lts-vivid xserver-xorg-input-all-lts-vivid libwayland-egl1-mesa-lts-vivid

Big thank you to Hadi Skeini https://plus.google.com/112809610336884273312/posts/N4heSGARJp5