charon-cmd software package provides standalone IPsec client, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install charon-cmd
charon-cmd is installed in your system.
Make ensure the charon-cmd package were installed using the commands given below,
$ sudo dpkg-query -l | grep charon-cmd *
You will get with charon-cmd package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Network |
| Package | charon-cmd |
| Version | 5.3.5-1ubuntu3 |
| Description | standalone IPsec client |
| Sub Section | Net |