So I disabled Capslock a while ago when I finally upgraded to 10.04 (via System ➜ Preferences ➜Keyboard ➜ Layout ➜ Options). Now, I simply want to set it to Make CapsLock an additional ESC. But Ubuntu seems to hate Capslock so much, that, as soon as I close the dialog, it resets it to disabled.
My best guess is, that it can't write the setting due to some ownership issues, but I couldn't figure out where the setting is actually stored.