GNU/Linux ASUS USB-AC68 Setup – Step-by-step Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install ASUS USB-AC68 AC1900 Wireless 802.11ac Driver in GNU/Linux Computers.
And the GNU+Linux ASUS USB-AC68 Setup is based on the Realtek rtl8814AU Chipset Driver Installation.
GNU/Linux ASUS USB-AC68 Wireless Driver Installation Guide