$ sudo apt-get update
$ sudo apt-get install libpython3-stdlib 

libpython3-stdlib is installed in your system.

Make ensure the libpython3-stdlib package were installed using the commands given below,

$ sudo dpkg-query -l | grep libpython3-stdlib *

You will get with libpython3-stdlib package name, version, architecture and description in a table

libpython3-stdlib package basic information: