To JoLLyRoGer:
The answer to your question was given in german forum http://debianforum.de/forum/viewtopic.php?f=2&t=121199#p772330. What worked for me was editing /etc/pam.d/gdm3 and throwing out (commenting) the line with ... user != root ... Then you can login as root.
To all others:
A...
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