$DISPLAY variable empty after SSHing

[Mark J. Reed]

X11 forwarding has to be enabled on the server.  If it's not, then any
request by the client to forward X connections (due to -X or -Y
options or ForwardX11 in ~/.ssh/config or /etc/ssh_config or wherever)
will be ignored.

Check the sshd_config on the final host (the "work computer").

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