The following thread describes the .LRN installation (though in English):
https://openacs.org/forums/message-view?message%5fid=177317There are multiple Knoppix Distributions available, sadly (at the moment) none in German (to my knowledge), though we (might) be working on it:
https://openacs.org/forums/message-view?message%5fid=202430
Last but not least, you can always ask me for access to a demo server that we have in German at http://www.theservice.de