wiki info
Used information from\\
http://technowizah.com/2006/10/debian-how-to-aiglx-compiz.html
...
Restart the X server (Ctrl+Alt+backspace)\\
Now - install gconf to change settings:\\
sudo apt-... lly and change from Disabled to:\\
<Alt>F10\\
now this should take effect immediately, so alt+F10 t... t exist at all when you install Compiz. Wierd I know, but since you installed Compiz-gnome it expected