you probably mean keymap.
i have lubuntu here, and it has a keuboard icon in the system tray, bottom right.
right-clicking that -> preferences -> input methods.
since it seems you live in germany, you should choose "German". Assuming your laptop has a german keyboard.
that should help, but maybe it's not persistent across reboots?
Last edited by ondoho; 05-11-2014 at 01:20 PM.