$ sudo apt-get update
$ sudo apt-get install openvswitch-ipsec 

openvswitch-ipsec is installed in your system.

Make ensure the openvswitch-ipsec package were installed using the commands given below,

$ sudo dpkg-query -l | grep openvswitch-ipsec *

You will get with openvswitch-ipsec package name, version, architecture and description in a table

openvswitch-ipsec package basic information: