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

dh-apparmor is installed in your system.

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

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

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

dh-apparmor package basic information: