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I'm using systemd-nspawn to "boot" a second Linux OS from a USB hard disk. I'd like to launch that OS's Gnome Desktop in a second X server running on the same machine on a different tty than the Desktop that is already running on tty1.

e.g. I have Gnome on tty1 running on the host machine. I'd like to launch the USB drive's KDE desktop in tty2 (in a 2nd X server I'm assuming). It seems possible somehow.

How can it be done?

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It's possible, but not easy...

First, you have to bind mount tty2 and modules, so spawn the container using:

systemd-nspawn -bD /system/arch --bind /dev/tty2 --bind /lib/modules

Of course, spawn the container in tty2 terminal... then, you need to start an X-server in another tty, which somehow is failing in my device

startx -display :1 -- :1 vt2 &

Besides, you've better just freeze one server and start another in tty2, as both running would conflict and would be resource waster.

P.S.: There is also a guy that ran a container's program under host's xserver, here

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