apf-server software package provides Server for Active Port Forwarding, 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 apf-server
apf-server is installed in your system.
Make ensure the apf-server package were installed using the commands given below,
$ sudo dpkg-query -l | grep apf-server *
You will get with apf-server package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Network |
| Package | apf-server |
| Version | 0.8.4-1ubuntu3 |
| Description | Server for Active Port Forwarding |
| Sub Section | Net |