$ sudo apt-get update
$ sudo apt-get install libpam-apparmor 

libpam-apparmor is installed in your system.

Make ensure the libpam-apparmor package were installed using the commands given below,

$ sudo dpkg-query -l | grep libpam-apparmor *

You will get with libpam-apparmor package name, version, architecture and description in a table

libpam-apparmor package basic information: