psad software package provides Port Scan Attack Detector, 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 psad
psad is installed in your system.
Make ensure the psad package were installed using the commands given below,
$ sudo dpkg-query -l | grep psad *
You will get with psad package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Administration Utilities |
| Package | psad |
| Version | 2.2.1-2.1 |
| Description | Port Scan Attack Detector |
| Sub Section | Admin |