/usr/share/dbus-1/system-services/org.kde.kcontrol.kcmgrub2.service is in kde-config-grub2 0.5.0-0ubuntu3.
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.kcmgrub2
Exec=/usr/lib/kde4/libexec/kcmgrub2helper
User=root
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