So, I am writing this now from the desktop.
The inactive font looks very thin to me, its almost unreadable.
lang=de_DE leads also on this system to US keybindings.
The installer shows no "next" item at this point:
Again, a lot of the font looks so thin, that I am not confident, I even checked all the boxes, and filled all the fields.
I am also quite confused, since the lower bar suggests it allows for navigation, and clicking on it reveals something like a little bit of a virtual keyboard.