I'm used to use the keyboard layout option to type the accentuated characters in Esperanto.
This option is in System Settings > Keyboard Layout > Options > Adding Esperanto circumflexes (supersigno) > To the corresponding key in a Qwerty keyboard.
It worked great but since I upgraded to Ubuntu 12.04, this option has no effect.
I'm using Ubuntu in French with the keyboard layout French (variant) and Gnome-shell. I tested on another computer with Unity and there is the same issue.
Is it a known issue? I did not find anything about it…