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Sometimes, an application refuses to quit on Ubuntu and it becomes non-responding, which will oblige you to restart your computer. Fortunately, there is a command line utility called xkill that allows to kill any unresponsive application. The xkill command allows to force close a window or application with your graphical mouse pointer.

xkill Use

Open the terminal and issue this command:

xkill

Your mouse pointer will change to a cross, click the unresponsive program or window to force close it.



You can also run xkill by pressing ALT + F2, then running this command: xkill



That's it.

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