AppArmor

AppArmor is a MAC (Mandatory Access Control) system, implemented upon LSM (Linux Security Modules).

Kernel
You need to activate the following kernel options:

Software
Install and  from sunrise overlay.

GRUB and GRUB2
or

You should apply changes running

(optionally) Adding entry in fstab

Boot service
Adding it to boot runlevel:

Securing Skype
Put provided below as file to. Don't forget modifying it for yourself.