But if you're looking for a really (I mean really!) powerful, one of the best note taking open-source software that can be used in Ubuntu, then Xournal is one heck of an app!.
I mean, to begin with, Xournal looks like an actual note-book. It actually reminded of my childhood thus I felt really familiar and got a felling of secureness straightaway (not kidding dudes!). As said this is a very powerful, dedicated note taking application thus comes with a huge list of very useful,
features such as ...
*. Awesome tool-bar with tools like: Text, eraser, pen, highlighter!, vertical space and rectangle select tool, etc.
*. Change color, font, size, etc.
*. Change "pen/eraser" thickness.
*. A Ruler and a hand-tool.
*. Enhanced support for touch-screen users.
*. Change paper size and four built themes/templates.
*. Add/Edit pages (after or before your current page).
*. It even has the ability to view PDF files and you can save your notes in PDF format too.
*. Edit individual layers.
*. Zoom in/out.
*. Sent your notes directly to Printer.
*. Save files (saves all the changes such as text highlighter, font, ruler, etc).
*. Full Screen mode... are just a few to mention.
You can install Xournal in Ubuntu 11.04 Natty Narwhal, 11.10, 10.10 and 10.04 by using the below command in your Terminal window.
sudo apt-get install xournalRemember, Xournal is only a note taking software and cannot edit text files thus it's not a text editor. But the rest assured, this is probably one of the best (although the developers could invent the ability to share notes online which seems to be missing at the moment) that I've come up with without a doubt.
So, if you're searching for a Note taking app for Ubuntu that needs very little space (below 500Kb of size) + that has a beautiful looking GUI and lots of tools, then I highly recommend that you take a look at Xournal, because it's totally worth it!.