I am searching for a newuser-friendly way to kill non-responsive GUI applications under Unity.

I looked over the shoulder of a new Unity user who tried to use gscan2pdf - and gscan2pdf seems to be really broken - after not much tinkering it consumed much CPU und memory, the PC began trashing and the user needed to immediately kill the gscan2pdf GUI which was full-screen, non-responsive and had the focus.

Ok, I know some ways how to do it:

• Hit Alt+F2 and type xkill -> select the window


• Hit Alt+F2 start xterm, use top or pgrep and then kill PID or directly use pkill

Both are ways which are not very intuitive for GUI centric users.

Is there some Unity shortcut to get something like xkill?

Or is the best GUI-way to add a top-like GUI to the Unity-starter? And which one?