The goal here, is to disable any chance of a hacker/snooper "walking in" or "breaking in" to my system. With pretty solid firewall rules, stable VPN, config tweeks, crypto, and other security, I now need to rest comfortably knowing that any attack from a remote computer by trained, but not nation-state, hacker, can be thwarted

The system settings of AA 17.10 show no file sharing or remote desktop ability....I want to make absolutly sure of that. Since public wifi is often used due to the nature of my work, my concern is an attacker establishing an unauthorised remote connection for nafarious purposes.

With an absence of a remote connection manager or file sharing be sufficient for securing the backdoor (if there is one) in Ubuntu?

all comments and suggestions are welcomed.