Hi!
This adapter is not well supported, that’s why you’re having issues with it, you can try to manually install its drivers but it will still give you issues with packet injection and monitor mode, as mentioned in the course requirements you need a powerful adapter that supports monitor mode and packet injection,checkout the adapters on the following link, they all support monitor mode and packet injection:

https://www.zsecurity.org/​shop

If you’re not sure which one to get the checkout the adapters video in the resources of lecture 11, here is a link to it anyway:

https://www.youtube.com/watch?v=0lqRZ3MWPXY​​

If you want to install the drivers anyway:
https://forums.kali.org/showthread.php?44810-Realtek-RTL8812BU-Driver-for-Kali-Linux

Thanks!
Diego