When starting a new ubuntu gutsy system for development it is very recommend to have the latest sources of the program you want to develop. Of course. Usually you download it, unpack it, read the Readme, where you can might find some dependencies. Might not. Afterwards you do a './configure' and has to install other missing packages. For Elisa-Developement it is very usefull to use the latest svn sources of elisa itself and of course of pigment. And using Ubuntu Gutsy, there is a faster way than try-and-error on installing the missing dependencies.