I ran into the same problem just now.
At some point GNOME wouldn't start, so I ran:
$ apt install --reinstall gnome-session
That fixed my problem to start GNOME again, but then this problem
started to appear.
It seems gnome-terminal-server.service wasn't running
$ systemctl --user status gnome-terminal-server.service
Warning: gnome-terminal-server.service changed on disk. Run 'systemctl
--user daemon-reload' to units.
So I did that. And `systemctl --user gnome-terminal-server`, and now my
problem is resolved.
-- Toon
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