/usr/share/dbus-1/services/org.freedesktop.IBus.service is in ibus 1.5.17-3ubuntu4.
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.IBus
Exec=/usr/bin/ibus-daemon --replace --panel disable --xim
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