I’m specifically asking about upgrade impacts (e.g. from 43 to 44).
From my understanding, when rebasing to a new release, all packages get replaced by new ones, orphaned packages are automatically removed since it’s a completely new image being downloaded and the new defaults are automatically set (besides filesystem/partitions changes).
My question is, does anything else stays in the system from the old version? I’m asking specifically about files in /etc and other places where system files live. Thanks for your time and any answers!
In addition to what is described in the article linked in the previous post, /usr/local is also local state. You can check this with ls -l /usr/local or file /usr/local.