Ubuntu 15.10.

$ sudo apt-get install linux-headers-generic build-essential
$ git clone https://github.com/abperiasamy/rtl8812AU_8821AU_linux
$ cd rtl8812AU_8821AU_linux
$ make clean
$ make
$ sudo make install
$ sudo modprobe 8812au

configure dkms build (so it automatically builds for each new kernel)

$ sudo cp -R . /usr/src/rtl8812AU_8821AU_linux-1.0
$ sudo dkms add -m rtl8812AU_8821AU_linux -v 1.0
$ sudo dkms build -m rtl8812AU_8821AU_linux -v 1.0
$ sudo dkms install -m rtl8812AU_8821AU_linux -v 1.0

display dkms status

$ dkms status

remove:

$ sudo dkms remove -m rtl8812AU_8821AU_linux -v 1.0 --all
$ sudo rm -r /usr/src/rtl8812AU_8821AU_linux-1.0