Driver for the TP-Link AC600 Archer T2U Nano, on Kubuntu 18.04 Previous fix from June 6 didn't work for me
Solution 1:
You could install the latest drivers from this GitHub repo: https://github.com/aircrack-ng/rtl8812au.git
As per the repo, this is how you can install the drivers using DKMS method:
sudo apt update
sudo apt install dkms
git clone -b v5.6.4.2 https://github.com/aircrack-ng/rtl8812au.git
cd rtl8812au
sudo ./dkms-install.sh
Your USB WiFi adapter should be working now.