ns2 software package provides Discrete event simulator targeted at networking research, 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 ns2
ns2 is installed in your system.
Make ensure the ns2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep ns2 *
You will get with ns2 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Network |
| Package | ns2 |
| Version | 2.35+dfsg-1ubuntu2 |
| Description | Discrete event simulator targeted at networking research |
| Sub Section | Net |