GNU/Linux Ubuntu 18.04 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 for Ubuntu 18.04 Bionic LTS GNU/Linux Desktop.
And the Ubuntu 18.04 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 Ubuntu.
Especially relevant, if you are Unsure about your Wifi Device Chipset then see: How to Get Wireless Adapter Info on GNU/Linux.
GNU/Linux Ubuntu TP-Link TL-WN821N V5-V6 Wireless Driver Installation Guide