graphviz software package provides rich set of graph drawing tools, 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 graphviz
graphviz is installed in your system.
Make ensure the graphviz package were installed using the commands given below,
$ sudo dpkg-query -l | grep graphviz *
You will get with graphviz package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Graphics |
| Package | graphviz |
| Version | 2.26.3-10ubuntu1.2 [amd64, i38 |
| Description | rich set of graph drawing tools |
| Sub Section | Graphics |