To manage Ubiquiti UniFi devices, a UniFi controller is required. Over a year ago, I initially installed the controller software inside a Ubuntu VirtualBox VM. Now that version 6 of the UniFi controller software is released, it’s time to upgrade. I decided to reinstall the controller inside a TrueNAS jail instead of a VirtualBox VM. When searching the interwebs, I only found lots of outdated instructions. It turns out that it’s very straightforward, so here are my quick notes on how to do it.