$ sudo apt-get update
$ sudo apt-get install lemonldap-ng-handler 

lemonldap-ng-handler is installed in your system.

Make ensure the lemonldap-ng-handler package were installed using the commands given below,

$ sudo dpkg-query -l | grep lemonldap-ng-handler *

You will get with lemonldap-ng-handler package name, version, architecture and description in a table

lemonldap-ng-handler package basic information: