Xorg core dump Device or resource busy

[Mykola Sokolov]

The system works fine without X. In case X does not start then I can go to
the virtual terminal and restart it manually or I can reboot until the next
error. But I always need X so I don't work a lot without X.
I have not tried a more simple working setup. I have 2 seats configured.

mykola at k-workstation:~$ loginctl
SESSION  UID USER     SEAT  TTY
     c6 1000 mykola   seat0
     c7 1001 svetlana seat1


What should I do? Disconnect the second mouse and keyboard or disable the
second seat or booth?
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