How to use Avogadro molecule editor and visualizer in education on Linux

Avogadro is a molecule editor and visualizer, and one of the most advanced open source scientific software tools. It features many capabilities that can be useful in teaching as education can be much more effective when theory is combined with the actual depiction of realistic models. Here is a basic tutorial on how to use Avogadro in education. Please note that I am using the latest stable release which is version 1.1.1, but there is also a version 2.0.7 which is a complete re-write of the application.