wireless-regdb-metztli
This debian source builds updated wireless-regdb suitable for Debian Linux 4.15.15 (4.15.x?) as currently not even Unstable (Sid) provides the files needed to prevent error(s) such as:
platform regulatory.0: firmware: failed to load regulatory.db (-2)
[ 12.134223] firmware_class: See https://wiki.debian.org/Firmware for information about missing firmware
[ 12.134281] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 12.134283] cfg80211: failed to load regulatory.db
Specifically, it provides updated files:
/lib/firmware/regulatory.db
/lib/firmware/regulatory.db.p7s
/usr/lib/crda/regulatory.bin
from https://wireless.wiki.kernel.org/en/developers/regulatory/wireless-regdb