

Something that really improved my life was learn to properly use find, grep, xargs and sed. Besides that, there are these two little ‘hacks’ that are really handy at times…
1- find out which process is using some local port (i.e. the modern netstat replacement):
$ ss -ltnp 'sport = :<port-number>'
2- find out which process is consuming your bandwidth:
sudo nethogs


Yeah, PPAs usually complicate things. IIRC the advice is disabling them before upgrading major versions, but this can be a pain if you use many repositories simultaneously