gns3 software package provides graphical network simulator, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gns3
gns3 is installed in your system.
Make ensure the gns3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gns3 *
You will get with gns3 package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Network |
| Package | gns3 |
| Version | 0.7.4-1 |
| Description | graphical network simulator |
| Sub Section | Net |
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