$ sudo apt-get update
$ sudo apt-get install python-pyasn1-modules 

python-pyasn1-modules is installed in your system.

Make ensure the python-pyasn1-modules package were installed using the commands given below,

$ sudo dpkg-query -l | grep python-pyasn1-modules *

You will get with python-pyasn1-modules package name, version, architecture and description in a table

python-pyasn1-modules package basic information: