Frozen Windows

Sometimes you can have a frozen window, and there are two fast ways to solve this problem without turning off your computer or restarting it. First, you can try the traditional key combination of Ctrl + Alt + Backspace.

The other way is a little more complicated than the previous one but is more efficient. Hit Ctrl + Alt + F2 to jump to the virtual console. Then log in with your user name, password and type the following:

ps -ax | grep startx

This executed command will provide you the PID of your Xserver. Then kill it with the next command

kill -9 PID_Number

If you want return to your first console, just press Alt + F1.