pnscan software package provides Multi threaded port scanner, 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 pnscan
pnscan is installed in your system.
Make ensure the pnscan package were installed using the commands given below,
$ sudo dpkg-query -l | grep pnscan *
You will get with pnscan package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Network |
| Package | pnscan |
| Version | 1.11-6 |
| Description | Multi threaded port scanner |
| Sub Section | Net |