1. Download driver RTL8812au from this website https://github.com/AstroDrabb/rtl8812au
2. Use the “Download ZIP” button on the sidebar at the right of the page to download it.
3. After downloading, please extract the ZIP file.
4. Then go to the folder where you extracted it, right-click in the white space inside that folder > Open in Terminal.
5. In that terminal, please run these commands:
sudo make install
The second command will ask for your password. You will not see anything while typing it.
6. You're done.