$ sudo apt-get update
$ sudo apt-get install python-pyftpdlib 

python-pyftpdlib is installed in your system.

Make ensure the python-pyftpdlib package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-pyftpdlib *

You will get with python-pyftpdlib package name, version, architecture and description in a table

python-pyftpdlib package basic information: