With the recent upgrades, that error is now gone.
** No longer affects: xorg-server (Ubuntu)
** No longer affects: gdm3 (Ubuntu)
** No longer affects: systemd (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Invalid
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You received this bug notification because you are a
** Description changed:
Gnome-shell session on xorg, with no opened apps
Getting this logged:
oem@ubuntu:~$ journalctl -b | grep XSERV
/usr/lib/gdm3/gdm-x-session[1289]: _XSERVTransSocketUNIXCreateListener:
...SocketCreateListener() failed
/usr/lib/gdm3/gdm-x-session[1289]: