Create a systemd service and add this to the [Service] section:

[Service]

Exec=gnome-session-quit --logout --no-prompt

How to start a systemd service after user login and stop it before user logout

How create a service in linux that can handle queries?

gnome-session-quit

Or you can also try which probably won't work.

@reboot sleep 60 && gnome-session-quit --logout --no-prompt This might help to wait 60 sec, if the session isn't fully loaded when the system starts, and the logout command might not work immediately for that reason.

Create a systemd service and add this to the [Service] section:

[Service]

Exec=gnome-session-quit --logout --no-prompt

How to start a systemd service after user login and stop it before user logout

How create a service in linux that can handle queries?

gnome-session-quit

Or you can also try the following, which probably won't work:.

@reboot sleep 60 && gnome-session-quit --logout --no-prompt 

This might help to wait 60 sec, if the session isn't fully loaded when the system starts, and the logout command might not work immediately for that reason.