Sehr geehrter Dr. Nikolaus Klepp,
Ok. To run programs as root on X11 you need to transfer X credentials to root. This can be done by hand (eek!) or just use "sux".
Probably also the reason sux is dead upstream and sux was pretty much a Debian issue.
To /etc/pam.d/su add: ---8<--- # Forward xauth keys between users if invoker is root or UID 1000 or higher session optional pam_xauth.so systemuser=999 --->8---
A 6 year old patch, that still works.
Regards, Peter.
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