Install strongswan by entering the following commands in the terminal:
sudo apt update sudo apt install strongswan
Description:
IPsec VPN solution metapackage
The strongSwan VPN suite uses the native IPsec stack in the standard Linux kernel. It supports both the IKEv1 and IKEv2 protocols. . This metapackage installs the packages required to maintain IKEv1 and IKEv2 connections via ipsec.conf or ipsec.secrets.
Homepage: http://www.strongswan.org
Version: 5.6.2-1ubuntu2
Section: net