I installed yesterday new drivers from NVIDIA in my Ubuntu 14.04. I had to stop server X so I used the "famous"
sudo service lightdm stop
Today I updated my system and it seems like lightdm is off. I tried to start again the process with:
sudo service lightdm start
Nothing happened. The result was:
start: service failed to start
If I try to restart it also fails, and if I try to stop it again (to reinstall the drivers, because I don't know what else I can do) this happens:
stop: Unknown instance:
What can I do?
