If you want to start fresh a lot of people falsely assume that an apt remove and then reinstall or apt --reinstall install package will start you off fresh.  To be sure and remove all associated config files do the below with the example of ssh server (don't remove it though if you actually use it!)

The key below is using the --purge flag or apt-get purge proftpd (eg sudo apt --purge remove packagename)

apt purge proftpd; apt install proftpd

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