How to shut down X?

Solution 1:

To Stop X.Org Server:

sudo service lightdm stop

To Start X.Org Server:

startx

##(OR)

sudo service lightdm start

To Restart X.Org Server:

sudo service lightdm restart

In all cases, replace lightdm with whatever greeter/display manager you use. lightdm is Ubuntu's default display manager.

When you type sudo service lightdm stop, it replies lightdm stop/status: This is a clue.

sudo lightdm stop