/lib/udev/rules.d/85-regulatory.rules is in crda 1.1.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # Runs CRDA for kernel wireless regulatory events.
# For more information see:
# http://wireless.kernel.org/en/developers/Regulatory/CRDA
KERNEL=="regulatory*", ACTION=="change", SUBSYSTEM=="platform", RUN+="/sbin/crda"
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