As part of an unattended installation, it was necessary to install a binary nvidia graphics driver. This is a manual proces by default. However, it can be done fully automatic:
prerequisite: install xserver-xorg-dev package or similar xorg development package.
sh NVIDIA-.run -q -a -n -X -s
That's all there is to it. The -q option means quiet, the -a option means accept licence, the -n action suppresses questions, the -X option updates the xorg.conf file and the -s option disables the ncurses interface.