Installing driver for TP-LINK Archer T9UH AC1900 on Ubuntu 18.04

Recently bought a WiFi booster to combat patchy WiFi in my uni dorm, works perfectly with Windows as driver installation was easy to follow, yet I can't seem to figure out how to install the Ubuntu drivers. The picture attached is the guide to installing with Ubuntu but I can't follow it, could someone really spell it out step by step like I'm 5 years old please

in my /lib/modules directory there are 4 directories, 4.15.0-29-generic, 4.15.0-62-generic, 4.15.0-64-generic, 4.15.0-65-generic, which on of these should I enter? Additionally the guide says to enter the command "make clean" but I receive and error saying I didn't specify a target.

EDIT:

uname -r
4.15.0-65-generic
lsusb
Bus 002 Device 003: ID 04f2:b52d Chicony Electronics Co., Ltd
Bus 002 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 0a5c:216d Broadcom Corp.
Bus 001 Device 003: ID 2357:0106
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
dmesg | grep 88x2bu
[No output]

1 Answer

With a temporary working internet connection by ethernet, tethering or whatever means possible, open a terminal and do:

git clone
sudo dkms add ./rtl8814au
sudo dkms install rtl8814au/4.3.21

Reboot. Your wireless should now be working.