Install UniFi Controller on Debian 12

Install LibSSL, MongoDB and OpenJDK

If not already installed, install sudo and add your username to the sudo group.

/sbin/adduser USERNAME sudo

Download and install LibSSL 1.1.1 needed for MongoDB

wget http://ftp.debian.org/debian/pool/main/o/openssl/libssl1.1_1.1.1w-0+deb11u1_amd64.deb -O libssl.deb && sudo dpkg -i libssl.deb

Download and install MongoDB 4.4.27 - current highest version supported UniFi Controller 8.0

wget https://repo.mongodb.org/apt/debian/dists/buster/mongodb-org/4.4/main/binary-amd64/mongodb-org-server_4.4.27_amd64.deb -O mongodb.deb && sudo dpkg -i mongodb.deb

Enable and start MongoDB

sudo systemctl enable mongodb && sudo systemctl start mongodb

Install the OpenJDK 17 runtime needed by the UniFi Controller

sudo apt install openjdk-17-jre-headless

Install UniFi Controller

Add UniFi Repository

echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/ubiquiti-archive-keyring.gpg] https://www.ui.com/downloads/unifi/debian stable ubiquiti' | sudo tee /etc/apt/sources.list.d/100-ubnt-unifi.list >/dev/null

Add GPG key for UniFi Repository

curl https://dl.ui.com/unifi/unifi-repo.gpg | sudo tee /usr/share/keyrings/ubiquiti-archive-keyring.gpg >/dev/null

Update APT and Install

sudo apt update && sudo apt install unifi

Access UniFi Controller https://IPADDRESS:8443