Is there open source elearning software that works easily on Ubuntu?

The best I ran in to would be ...

Wink

Wink is a Tutorial and Presentation creation software, primarily aimed at creating tutorials on how to use software (like a tutor for MS-Word/Excel etc). Using Wink you can capture screenshots, add explanations boxes, buttons, titles etc and generate a highly effective tutorial for your users.

Features:

1. Freeware: Distributed as freeware for business or personal use. However if you want to redistribute Wink, you need to get permission from the author.
2. Cross-Platform: Available for all flavours of Windows and various versions of Linux (x86 only).
3. Audio: Record voice as you create the tutorial for explaining better.
4. Input formats: Capture screenshots from your PC, or use images in BMP/JPG/PNG/TIFF/GIF formats.
5. Output formats: Macromedia Flash, Standalone EXE, PDF, PostScript, HTML or any of the above image formats. Use Flash/html for the web, EXE for distributing to PC users and PDF for printable manuals.
6. Multilingual support: Works in English, French, German, Italian, Danish, Spanish, Serbian, Japanese, Brazilian Portuguese and Simplified/Traditional Chinese.
7. Smart Capture Tools: Capture screenshots automatically as you use your PC, based on mouse and keyboard input (great time saver and generates professional captures).
8. Performance/Quality: Creates highly compressed Flash presentations (few kbs to few hundreds of kbs, much smaller than competing commercial products) ideal for using on the web.

There are 2 others but they seem to lack features Wink does have: Kazam and Tibesti.

It is not in the repositories though so you need to install it from source. I only found a how-to on installing on x64 but looks like it is pretty straightforward.

Check out eXeLearning: it was originally developed by the Ministry of Education of New Zealand and it is now being worked on by my company and the open source center of the Spanish government.

eXeLearning

It has a lot of the features from Captivate ; you can add video/audio, export to SCORM, make quizzes, use mini games etc. eXeLearning 2.0 beta has more features and is being stabilized now.

Adapt Learning is a tool for creating e-learning that will run just fine on Linux. Not only that, it's open source too ;-)