/usr/share/dbus-1/services/sessioninstaller.service is in sessioninstaller 0.20+bzr150-0ubuntu4.1.
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.freedesktop.PackageKit
Exec=/usr/bin/session-installer
|