$ sudo apt-get update
$ sudo apt-get install kernel-patch-grsecurity2 

kernel-patch-grsecurity2 is installed in your system.

Make ensure the kernel-patch-grsecurity2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep kernel-patch-grsecurity2 *

You will get with kernel-patch-grsecurity2 package name, version, architecture and description in a table

kernel-patch-grsecurity2 package basic information: