Comment 10 for bug 322068

The fact that its not a problem in GNOME, does not mean that it is not a problem. It just means that gnome-control-center is not the correct upstream. This ticket still describes a real problem in Ubuntu, but as I mentioned in my previous comment it is caused by the was X.org handles the keyboard.

I'm not an X.org developer, I believe this is fixable by causing X.org to do the change on key release instead of key press, emit all the relevant key codes always, and only do the group switching (or whatever action was supposed to be done) only if the specified keys where the only keys used.