In its essence Krita is a software for drawing (you can see some examples at the top of this site's right sidebar). Krita development is on constant motion and the official Ubuntu packaging can keep up. If you would like to try the latest Krita enhancements without the hassle of compiling it yourself from source, see below how to.
Install from Krita Lime PPA
Open a terminal window and run:
sudo add-apt-repository ppa:dimula73/krita -y && sudo apt-get update && sudo apt-get install krita-testing krita-testing-dbg -y
After installing you should restart your computer.
Krita can be accessed via Applications Menu > Graphics >Krita or typing the following command: