libnuclient4 software package provides The authenticating firewall [client library], 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 libnuclient4
libnuclient4 is installed in your system.
Make ensure the libnuclient4 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libnuclient4 *
You will get with libnuclient4 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Network |
| Package | libnuclient4 |
| Version | 2.4.3-3 |
| Description | The authenticating firewall [client library] |
| Sub Section | Net |