Are you really sure you need FTP, specifically? If you’re just interested in transferring files securely, then you’ll want SFTP instead of FTP. It’s way past time to stop using FTP.The fastest and easiest way to get SFTP is to install the package openssh-server and no further configuration is needed. Then you can uninstall FTP. The packages Nautilus, Dolphin and FileZilla all include built-in SFTP clients.