Ubiquity UniFi Controller Failed to Start on Raspberry Pi
- Installing the UniFi Controller on Raspbian on a Pi failed to start
- Fixed it by installing Java 8 first then re-installing instead of letting apt auto select Java 9
As I’m running Raspbian 4.19 I followed the official UniFi “How to Install and Update via APT on Debian or Ubuntu”.
sudo apt update && sudo apt install ca-certificates apt-transport-https echo 'deb http://www.ui.com/downloads/unifi/debian stable ubiquiti' | sudo tee /etc/apt/sources.list.d/100-ubnt-unifi.list sudo wget -O /etc/apt/trusted.gpg.d/unifi-repo.gpg https://dl.ui.com/unifi/unifi-repo.gpg # You might also need to run "sudo apt update" at this point sudo apt install unifi
Once installation of all the dependencies and unifi was complete I went to
https://my-pi:8443/ in my browser on my PC but I saw a connection refused.
UniFi Controller not Starting
Ok, I thought it might be the firewall, so I did:
sudo ufw add 8443
but still no connection.
So I tried
wget https://localhost:8443, but also got connection refused!
I checked the log files:
However, neither file had even been created!
sudo service unifi status but it seemed to show a process that had
only just started, usually less than 1 second ago.
It looked like it was continually restarting.
After some more searching, help came from the UniFi - Controller FAQ page.
java -version and saw it had installed Java 9 but the FAQ says only
Java 8 is supported.
Install Java 8 and then the UniFi Controller
sudo apt remove unifi sudo apt-get autoremove -y sudo apt install openjdk-8-jre-headless sudo apt install unifi sudo service unifi start sudo service unifi status
java -version shows 8 not 9 and the UniFi Controller software starts and runs as intended!