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

python-beautifulsoup is installed in your system.

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

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

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

python-beautifulsoup package basic information: