I have just migrated from Ubuntu 10.04 to 12.04. As most of the UI elements have been changed I don't know to add Force quit icon, which is needed for most of the not responding applications. So, how to add force quit icon in ubuntu 12.04?
In the terminal, run these commands:
Now in the window that popped up, drag
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A far easier way is to simply head over to your keyboard shortcuts, add a custom one to let's say F11, name it something like "Kill non-responsive windows" and with the command used xkill.