Add source
echo 'deb http://www.ubnt.com/downloads/unifi/debian stable ubiquiti' | sudo tee -a /etc/apt/sources.list.d/100-ubnt.list
Add keys
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv C0A52C50 && sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
Update system
sudo apt-get update
Install Unifi controller
sudo apt-get install unifi -y
Edit Unifi config files
sudo pico /usr/lib/unifi/data/system.properties