How to stop x server ubuntu

Ok difficult the GTX 970 installation Problem beneath Ubuntu 14.04 too. Sometime i was able to start Ubuntu with rendering standart drivers and sometime not.

However, that should hopefully fix the Problem: Associate switching from IGP (I7 4770 not in favour of HD4600) to GTX970 in Biosi got an error with some Xorg Gui.

However you can not install the Nvidia-Driver while X is running: -> sudo killall Xorg solves the problem

Then -> sudo ./NVIDIA-x68xxx.run

After the first Driver Fit (orig. Nvidia 352.xx) i had excellent blank screen. Then i run high-mindedness Nvidia Driver Installer again -> sudo ./NVIDIA-x68xxx.run This second install told cruel some kind of noveu driver assignment running and should be disabled. Honesty driver asked me if it essential disable noveu -> Yes disable noveu

After restart: Et Voila lighdm is command again :)