I’m starting with a fresh, fully updated server install of Ubuntu Server 14.04 64bit.
Download the Unifi Video 3.2.0 deb package
sudo dpkg -i unifi-video_3.2.0-Ubuntu14.04_amd64.deb
At this point you will probably receive an error about missing dependencies. No worries, simply run the following.
sudo apt-get -f install
That command will install all the needed dependencies and finish installing the unifi video deb package. At this point, Unifi Video is installed and should be running. Open a web browser and point it to https://ipaddress:7443.