GNU/Linux Debian Buster TP-Link TL-WN821N V5/V6 Wifi Driver Setup – Step-by-step Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install TP-Link TL-WN821N V5/V6 Wireless 802.11ac Driver in Debian Buster 10.x GNU/Linux.
And the Debian Buster TP-Link TL-WN821N V5/V6 Adapter is based on the Realtek rtl8188EU Chipset.
So here below you find instructions to Install rtl8188EU Driver on Linux.
Especially relevant, if you are Unsure about your Wifi Device Chipset then see: How to Get Wireless Adapter Info on GNU/Linux.
GNU/Linux Debian TP-Link TL-WN821N V5-V6 Wireless Driver Installation Guide