Correct, unRAID unpacks fresh from RAM on every boot.    Technically speaking this item is the only one on the list that can't be done without using Docker/VM, due to the fact that unRAID does not have apt-get (or any common package manager for that matter). While this is not the only way to do things it is definitely the one i recommend. I would start by looking on docker hub for a base image of a distro you are most comfortable using, preferably an official image or one from