/etc/dbus-1/system.d/org.kde.kcontrol.kcmlightdm.conf is in lightdm-kde-greeter 0.3.2.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | <!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- Only user root can own the foo helper -->
<policy user="root">
<allow own="org.kde.kcontrol.kcmlightdm"/>
</policy>
</busconfig>
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