openvpn-auth-radius software package provides OpenVPN RADIUS authentication module, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install openvpn-auth-radius
openvpn-auth-radius is installed in your system.
Make ensure the openvpn-auth-radius package were installed using the commands given below,
$ sudo dpkg-query -l | grep openvpn-auth-radius *
You will get with openvpn-auth-radius package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Network |
| Package | openvpn-auth-radius |
| Version | 2.1-6 |
| Description | OpenVPN RADIUS authentication module |
| Sub Section | Net |