Whenever I try to run any X application as root, this happens:
root@penguin:~# scribus
No protocol specified
scribus: cannot connect to X server :0
If I run echo $XAUTHORITY on either root or the primary user it is empty, just returns an empty line.
Running ./Xauthority in either home directory:
-bash: ./Xauthority: No such file or directory
It also does not help to run xhost +localhost