/usr/share/dbus-1/system-services/fi.w1.wpa_supplicant1.service is in wpasupplicant 0.7.3-6ubuntu2.
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=fi.w1.wpa_supplicant1
Exec=/sbin/wpa_supplicant -B -P /run/sendsigs.omit.d/wpasupplicant.pid -u -s -O /var/run/wpa_supplicant
User=root
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