vsftpd, is an FTP server for Unix-like systems, including Linux.
To get vsftpd up and running, do the following as root.
apt-get install vsftpd ftp systemctl restart vsftpd.service cd /etc vi vsftpd.conf uncomment local_enable = YES
That should be enough to just get it up and running and make it possible to ftp to the debian server using a login.
You should also familiarize yourself with other settings in vsftpd.conf and set them appropriately for your needs.