$ sudo apt-get update
$ sudo apt-get install krb5-pkinit 

krb5-pkinit is installed in your system.

Make ensure the krb5-pkinit package were installed using the commands given below,

$ sudo dpkg-query -l | grep krb5-pkinit *

You will get with krb5-pkinit package name, version, architecture and description in a table

krb5-pkinit package basic information: