/usr/share/dbus-1/system-services/org.freedesktop.systemd1.service is in systemd-shim 9-1bzr4ubuntu1.
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.freedesktop.systemd1
User=root
Exec=/usr/lib/x86_64-linux-gnu/systemd-shim
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