I'm trying to find one locally today and would like to avoid having to troubleshoot to get it working.

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2 Answers

According to Wikidevi, the Atheros AR9002U chipset is used in the TP-Link TL-WN722N. This device uses the driver ath9k_htc which is built in to all recent Ubuntu versions including 18.04. The needed firmware is already included in the package linux-firmware.

Please use caution. The device TL-WN722N has been produced in several versions:

*Version 1.10 has been seen printed on the box but is still the same chipset. "2052500328" and "REV: 1.1" is silkscreened on the board (PCB Version 1.1)

*Product Version 1.10 (on the box) with PCB Version 1.2 has been seen but is still the same chipset (minor layout differences vs. PCB Version 1.1)

*Version 2.x is using Realtek RTL8188EUS chip. See TP-LINK TL-WN722N v2.

*Version 3.x is using Realtek RTL8188EUS chip. It is a rebadged v2.

Versions 2.x and 3.x wiill require that a driver be downloaded and compiled from source code.

Versions 1.1 and version 1,2 will work out of the box in Ubuntu 18.04.

According to the kernel.org page, the ath9k_htc driver provides hardware support for Atheros AR9001 and AR9002 family hardware.

On the webpage you will find more details about supported and unsupported features, as well as downloadlinks and configuration. The driver is a default driver in Ubuntu 18.04.