$ sudo apt-get update
$ sudo apt-get install python-flufl.lock 

python-flufl.lock is installed in your system.

Make ensure the python-flufl.lock package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-flufl.lock *

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

python-flufl.lock package basic information: