prerex software package provides course prerequisite chart editor for LaTeX/TikZ, 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 prerex
prerex is installed in your system.
Make ensure the prerex package were installed using the commands given below,
$ sudo dpkg-query -l | grep prerex *
You will get with prerex package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | TeX |
| Package | prerex |
| Version | 6.4.0-3 |
| Description | course prerequisite chart editor for LaTeX/TikZ |
| Sub Section | TeX |