Tee gnome-settings-daemon to not apply xrandr changes.
It does not know about the puavo-ltsp-client, it does the wrong
thing and undoes the changes made by puavo-ltsp-client.
Make sure that when lightdm is configured
the language-pack-gnome-de is also installed.
This is so that on the thinclient image case the correct
language packages are in (needed by lightdm).