Its going to be a couple days till I can upgrade my system to Zorin OS 18, due to time constraints. I've been told however, that before I do that, I have to remove PPA's I've added to the system first. Unfortunately, since the system lumps all PPA's together, I can't differentiate, except for one, my Star Labs PPA. Based on 3 screenshots I had to take, which PPA's do I need to remove, before starting the OS upgrade process?
