I've installed compiz setting manager. I interested in winodw management section, grid plugin. The short key for "put center" is KP5, i assumed that is Ctrl+Alt+5. But when I using this combination nothing changed. The num is on on the numpad. What exectly should I press to move window to the grid? Thanks.
UPDATE: Maybe the problem caused by virtual machine? I'm running Ubuntu as guest machine. But another hotkeys work well.
1) Make sure the Grid plugin is enabled.
2) Click over the shortcut key combination and change it to what you want.
As our friend Uri Herrera said above, it makes difference if you use numpad keyboard.
Enjoy ;-)
It's probably because you're on a virtual machine. Do other Compiz effects work?
Some hotkeys are related to Compiz, but not all. The one that worked for you may have been a standard Gnome one.