Clear system data via upgrade or install from scratch?
I have not made clean install in the past 4 years, I think. So although I am trying to maintain the system, I can see that it’s becoming to fail apart.
Since I have not done new installation in the past years, I forgot what upgrade does exactly. Or to be precise, what the system upgrade does today (I can remember what it did 5 and more years ago).
I would basically like to clear all system wide settings but to preserve my files. This will be easy because I have a system of partitions where all my files are stored in non-system partitions.
If I do system upgrade, will Ubuntu erase all installed applications and basically reset the system to a fresh new system? I remember this could partially achieved in the past.
Or I have to install fresh new system and during installation format system partitions to achieve what I need?