Comment 9 for bug 194645

Ofir Klinger (klinger-ofir) wrote :

I experience it too: switching layout with either Alt+Alt or RAlt+Shift doesn't work until I go to keyboard preferences (System->Preferences->Keyboard) and reselect the layout (press the button indicates the current layout, and press Ok in the dialog opened).

The following post solved my problem:
http://ubuntuforums.org/showpost.php?p=4995013&postcount=7