/usr/share/dbus-1/services/kf5_org.kde.kuiserver.service is in plasma-workspace 4:5.12.4-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.kde.kuiserver
Exec=/usr/bin/kuiserver5
|