Run these scripts in order to get it working
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README.md

README.md

rtl8812au driver for Ubuntu 18.04 LTS and above

Works for the following distros:

  • Ubuntu 17.x
  • Ubuntu 18.04 LTS

Step 1 - Downgrade Kernel.

Main issue with the rtl8812au Wireless USB Adapter is the kernel. Because we can guarantee Ubuntu 16.04's kernel works with rtl8812au, we will downgrade to it.

cd /tmp/
rm *.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.1/linux-headers-4.8.1-040801-cloud_4.8.1-040801.201610170913_amd64.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.1/linux-headers-4.8.1-040801_4.8.1-040801.201610170913_all.deb
wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8.1/linux-image-4.8.1-040801-cloud_4.8.1-040801.201610170913_amd64.deb
sudo dpkg -i *.deb
sudo update-grub

I also recommend, but it's not necessary, removing all other kernels being used.

# This is optional!!
sudo apt-get remove linux-image-4.<whatever>
sudo update-grub

If not, config your GRUB file to enter the OS using the kernel 4.8.1. When done, reboot.

Step 2 - Install rtl8812au

cd Linux
bash install.sh

Wi-fi should start working.