Warning :the method presented in this article are too old to be applied now. Use this information at your own risk.
KDE related screenshots :
2D Painting applications :
sudo add-apt-repository ppa:achadwick/mypaint-testing
sudo apt-get update
sudo apt-get install mypaint
Installation notes :
To get Krita :
[edit : simplified all, things get simplier and thats a good news ]
Krita will install without any problem with the script of Kubuntiac ; download the script of Kubuntiac : http://forum.kde.org/viewtopic.php?f=139&t=92880 , and follow the instructions.
Only 1 trap : Old Gimp-painter needs patch
sudo apt-get build-dep gimp ./configure --prefix=/opt/gimp-painter --disable-default-binary make sudo make install
Your new Gimp should be able to be launched from /opt/gimp-painter/bin/gimp-2.6 , you can of course create a laucher or a sym link to /usr/bin/gimp to launch it faster.
Note : for building , you will need also commons package as 'make' , etc... If the instalation return error, please read what the computer complain ; it's often the lack of a library. Note the name , and open 'Muon' the package manager to install it.
Upgrading to 2.7x is also a solution to avoid the problem ( no Gimp-painter features ).