@bossbob Thanks for the help on this. However, I want to note that rtl8812au is the driver for this WiFi adapter (like you said in the intro of your answer) rather than the rtl8814au that is in the installation instructions. This discrepancy tripped me up a little so hopefully others will avoid this mistake.

@bossbob 

Hey! I got the same adapter for my laptop which has an old but working wireless card. I followed all the steps but nothing seems to be working. Can you please help. I'm on ubuntu 20.04

@logan2319 Hi! I seem to have made this exact mistake and cannot get my adapter to work. can you please help me out. I'm new to Ubuntu as well.

Hi @tapas05 

Can you post the result from the following terminal command? 

sudo lsusb.

I will find the right driver for you and help you install it.

Please include the type of hardware (pc/laptop/raspberry pi)

OS version and architecture (i386 or x64)

For anyone trying to get this working on Manjaro:

What you want is to install the rtl88xxau-aircrack-dkms-git package from the AUR using your package manager of choice. With yay, that's:

$ yay rtl88xxau-aircrack-dkms-git

It's likely that you'll be missing the necessary kernel headers, in which case you'll get the following error message:

==> Unable to install module rtl88xxau/r1164.b8167e6 for kernel *: Missing kernel headers.
 

If you have this issue, find your kernel version using:

$ Uname -r

This should return something like:

5.4.138-1-MANJARO
What's important is the two first numbers, in this case 5 and 4. Run

$ sudo pacman -S linux-headers

and select the appropriate headers from the list. In this case, linux54-headers, as the kernel version is 5.4.

Once you have the headers installed, you should be able to install the rtl88xxau-aircrack-dkms-git package normally and your tp-link adapter should just work.