/usr/share/dbus-1/system-services/org.kde.kcontrol.kcmsddm.service is in kde-config-sddm 4:5.5.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [D-BUS Service]
Name=org.kde.kcontrol.kcmsddm
Exec=/usr/lib/x86_64-linux-gnu/libexec/kauth/kcmsddm_authhelper
User=root
|