I am guessing you needed to enable a repository in order to find the software you were looking for. Some distributions will have things already enabled to make it easier on users where other developers take more of a "hands on" approach. BTW... when using ubuntu based systems, I prefer synaptic for running updates. My computer at work and Mum's machine run xubuntu. One thing that helps me is that I made a lot of videos... If I forget something I learned, I have video documentation I made to teach me what I did in the past... I know that may sound weird, but I re-learn things from my own video pool.