Solution 1:

I found some driver that should work. I forked the driver from https://github.com/diederikdehaas/rtl8814AU.git and added the dkms.conf there. I've sent a pull request to diederikdehaas too.

Run in a terminal

sudo apt install git build-essential dkms
git clone https://github.com/hanipouspilot/rtl8814AU.git
sudo dkms add ./rtl8814AU
sudo dkms install rtl8814AU/4.3.21

The driver has your IDs.

If you install the driver this way, it will stay after kernel upgrades.

Solution 2:

I just got this thing in the mail today. Bought it because someone in the comments said "plugged it in to linux and it worked right out of the box. Definitely not true. soo... tried Pilot6's solution, but it didn't work for me. Spent the last few hours digging. Long story short, found this other project by the same guy on github https://github.com/diederikdehaas/rtl8814AU

Here's what I did. Maybe someone smarter than me can fix my syntax if I'm not being very efficient...

git clone -b driver-4.3.21 https://github.com/diederikdehaas/rtl8814AU.git
cd rtl8814AU
sudo make && sudo make install

output of make install

install -p -m 644 8814au.ko  /lib/modules/4.4.0-59-generic/kernel/drivers/net/wireless/
/sbin/depmod -a 4.4.0-59-generic

So I ran

sudo modprobe -v 8814au

and got the below

insmod /lib/modules/4.4.0-59-generic/kernel/drivers/net/wireless/8814au.ko 

DMESG shows this

[4188.649295] rtl8814au 3-2.4.3:1.0 wlx2c4d5404a218: renamed from wlan

at this point I clicked the panel wifi icon and had two adapters. turned off the internal one (laptop) and connected with the new one. The adapter name was blank when typing in the password. Just ran speedtest.net and pulled 188 down and 53 up (Mbps). Was pulling about 45 down and 15 up before the new adapter. Hope this helps!

Solution 3:

This worked on Ubuntu 18.04 LTS: https://github.com/aircrack-ng/rtl8812au

On a good eduroam WiFi network, I was getting speeds over 100 Mbps.

But I've upgraded to 20.04, after reinstalling 18.04 after I accidentally deleted and overwrote my home directory, and trying to install it now so I'll update this answer soon.