p0f software package provides Passive OS fingerprinting tool, 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 p0f
p0f is installed in your system.
Make ensure the p0f package were installed using the commands given below,
$ sudo dpkg-query -l | grep p0f *
You will get with p0f package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Network |
| Package | p0f |
| Version | 2.0.8-2 |
| Description | Passive OS fingerprinting tool |
| Sub Section | Net |