Install libftp4 by entering the following commands in the terminal:
sudo apt update sudo apt install libftp4
Description:
Library of callable ftp routines
Ftplib presents a convenient C interface for the standard File Transfer Protocol (FTP). It makes it easier for programmers to use file transfer in their programs.
Homepage: http://nbpfaus.net/~pfau/ftplib/
Version: 4.0-1-3
Section: universe/libs