Installing USB WiFi driver

This page will help you to install USB WiFi driver dongle on Debian/Ubuntu OS.

RTL8812AU

$ sudo apt update
$ sudo apt install rtl8821au-dkms linux-firmware

RTL8821AU

$ sudo apt update
$ sudo apt install rtl8821au-dkms linux-firmware

RTL8821CU

$ sudo apt update
$ sudo apt install rtl8821cu-dkms linux-firmware