How to install wifi driver for Dual band USB Adapter

Question

Seeking your help on how to install the driver of Dual band USB Adapter. I followed the following steps but got no luck.

sudo apt update

sudo apt install --reinstall build-essential dkms git

git clone https://github.com/cilynx/rtl88x2bu.git

cd ./rtl88x2bu/

sudo rsync -rvhP ./ /usr/src/rtl88x2bu-${VER}

xuser@xcomputer:~/Downloads/rtl88x2bu$ sudo dkms add -m rtl88x2bu -v ${VER} Error! Invalid number of arguments passed. Usage: add / or add -m / or add -m -v

#Remaining steps that I haven't done yet.#

sudo dkms build -m rtl88x2bu -v ${VER} sudo dkms install -m rtl88x2bu -v ${VER} sudo modprobe 88x2bu

I'm new in Ubuntu and just got installed this version 18.04.

Thank you in advance! Regards,

J0m$