@Kevin_Z Thank you for your reply. Meanwhile, I asked the same question at AskUbuntu and received the solution for this problem. Since the T2u Plus has a Realtek rtl8812au Wifi chip, it's easy to...

Hi, I just got a TpLink Archer T2U Plus, the one with the big antenna. Works well on windows without any installataion, however I couldn't get it working on my Linux Ubuntu 19.10. with Kernel...