Confirm that the sddm proposed 0.20.0-2ubuntu4.1 doesn't have the suggested patch, but adding manually that lines to "/usr/lib/systemd/system/sddm.service" fixed the issue.
Confirm that the sddm proposed 0.20.0-2ubuntu4.1 doesn't have the suggested patch, but adding manually that lines to "/usr/lib/ systemd/ system/ sddm.service" fixed the issue.