How do you force close frozen aps (in wine, or otherwise) - Ubuntu Forums

Press Alt+F2 to bring up the "Run Application" dialog OR open a terminal. Type:

Code:

xkill

and press enter. You will get a skull and crossbones as your mouse pointer. Click the offending window and it will die.

You can also open a terminal and type:

Code:

killall nameofprogram

Go there...
http://ubuntuforums.org/showthread.php?t=483178

Don