contextfree software package provides image generator based on context-free grammars, 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 contextfree
contextfree is installed in your system.
Make ensure the contextfree package were installed using the commands given below,
$ sudo dpkg-query -l | grep contextfree *
You will get with contextfree package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Graphics |
| Package | contextfree |
| Version | 2.2+dfsg1-2 |
| Description | image generator based on context-free grammars |
| Sub Section | Graphics |