2.Click the add button in the above box
3.type xkill and click apply
4.Click on Disabled at the xkill row in the Keyboard Shortcuts window (Disabled is then changed to New shortcut...).
5.Press a new key combination, e.g. Ctrl+Alt+X (New shortcut... is then changed to Ctrl+Alt+X).
6.Click the Close button.
Xkill is ready for use. Press the above key combination to turn the cursor to an X-sign, move the X-sign and drop it into a program interface to terminate the unresponsive program, or cancel the X-sign with a right-click.
