Remembering that I am doing everything according to the Debian Wiki. Package wireless-tools it installed. My internal Intel adapter is working perfectly. Link Debian Wiki about atheros devices https://wiki.debian.org/ath9k_htc https://packages.debian.org/stretch/wireless-tools https://wiki.debian.org/WiFi/HowToUse
Packages affecteds https://packages.debian.org/stretch/linux-image-amd64 https://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git https://packages.debian.org/stretch/firmware-atheros So ignoring this error report is ignoring a problem that may be of many users around the world and this would be a big mistake.
