/usr/share/dbus-1/system-services/org.ukui.SettingsDaemon.DateTimeMechanism.service is in ukui-settings-daemon 1.1.6-0ubuntu1.
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.ukui.SettingsDaemon.DateTimeMechanism
Exec=/usr/bin/usd-datetime-mechanism
User=root
|