Update UniFi Controller & Devices through SSH

1. SSH into your Ubuntu/Debian machine, and login as root. ( Ubuntu | sudo -i | Debian | su ). Use Putty on Windows or Terminal on macOS.
2. Run this 1 liner: rm unifi-update.sh &> /dev/null; wget https://get.glennr.nl/unifi/update/unifi-update.sh && bash unifi-update.sh

All info on: UniFi Community