Do you have installed sddm
see the logs ?
Did it work before you installed sddm?
systemctl status ssdm.service Execute whatever command it uses in the systemd unit manually, see how it fails. Be sure to omit any quiet options and replace them with high verbosity options if applicable. See the journal logs using journalctl -u ssdm systemd unit troubleshooting 101 essentially *shrugs*
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