I want to start a second X server from within an already running X session.
Until debian 8 I can edit
/etc/X11/Xwrapper.config and change line
allowed_users=anybody. This allows me as an unprivileged user to run X from within X. X is a setuid wrapper for Xorg.
Things changed in debian 9, X is no longer a setuid wrapper, instead privileges needed by X are ruled by systemd. The file
/etc/X11/Xwrapper.config does not exist anymore.
It is possible to restore legacy behaviour with package
/etc/X11/Xwrapper.config has to contain the lines
Another possibility is to switch to one of tty1...tty6 and to run X with
xinit xterm -- :1 vt1 while vt1...vt6 must comply to tty1...tty6. (tty8...tty12 / vt8...vt12 are not available anymore.)
I want to avoid using legacy settings and to avoid switching to console. I want back the possiblity of
xinit xterm -- :1 vt8.
How can I setup systemd to allow unprivileged users to start a second X server from within an already running X?