Using Wireless ASUS PCE-AC68 on Ubuntu 14.04.5

I am having issue installing the driver of ASUS' PCE-AC68 on my Ubuntu 14.04 machine.

I have tried a few sources such as:

1. WiFi driver is not installed on Asus PCE AC68?




2. https://www.youtube.com/watch?v=vmXl6WsC3Kc

However, the problem I always face is that the command: always had error.

ERROR (dkms apport): kernel package linux-headers-4.4.0-79-generic is not supported
Error! Bad return status for module build on kernel: 4.4.0-79-generic (x86_64)
consult /var/lib/dkms/bcmwl/6.40.223.248+bdcom/build/make.log for more information
modprobe: FATAL: Module wl not found

I'm not too sure what to do anymore and would really appreciate assistance in getting this to work.