Configure FTP on Ubuntu 18

hm this is cli only even in ubuntu as it is a server service.

You will have to install an ftp server service (=daemon) like e.g. proftpd or vsftpd.

Then you might have to configure it (text based).

configs are mostly in /etc/ - e.g. /etc/vsftpd/vsftpd.conf for vsftp

similar for proftpd

What I currently don't remember is the default way to start them up.

vsftp usually starts standalown (service vsftpd start/stop/restart/reload).

proftpd could be set to be started as subservice of (x)inetd. Then you would have to restart/reload (x)inetd to restart/reload proftpd.

Keep in mind that if you change config you got at least to reload the service!