Why can't debian see USB wifi?

Question

linux

Was ubuntu - everything worked. now - debian+xfce.
Adapter: TL-WN722N

adapter photo (spoiler)

dmesg log (spoiler)

[ 1155.492143] usb 1-3: new high-speed USB device number 9 using ehci-pci
[ 1155.657233] usb 1-3: New USB device found, idVendor=0cf3, idProduct=9271
[ 1155.657247] usb 1-3: New USB device strings: Mfr=16, Product=32, SerialNumber=48
[ 1155.657255] usb 1-3: Product: USB2.0 WLAN
[ 1155.657262] usb 1-3: Manufacturer: ATHEROS
[ 1155.657270] usb 1-3: SerialNumber: 12345
[ 1155.658724] usb 1-3: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
[ 1155.661487] usb 1-3: firmware: failed to load ath9k_htc/htc_9271-1.4.0.fw (-2)
[ 1155.661517] usb 1-3: Direct firmware load for ath9k_htc/htc_9271-1.4.0.fw failed with error -2
[ 1155.661547] usb 1-3: ath9k_htc: Firmware htc_9271.fw requested
[ 1155.661615] usb 1-3: firmware: failed to load htc_9271.fw (-2)
[ 1155.661637] usb 1-3: Direct firmware load for htc_9271.fw failed with error -2
[ 1155.661651] usb 1-3: no suitable firmware found!
[ 1155.662385] usb 1-3: ath9k_htc: USB layer deinitialized

lsblk (spoiler)

Bus 001 Device 004: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
Bus 001 Device 007: ID 13d3:5092 IMC Networks 
Bus 001 Device 009: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

It's not in the network settings.
ifconfig and iwconfig don't say anything about this adapter either.

Answer 1

Main problem:
[ 1155.661651] usb 1-3: no suitable firmware found!
It is necessary to install the firmware-atheros package from the non-free repository
https://wiki.debian.org/ath9k_htc