Been using the Ubuntu Gutsy packages for Sugar while working on various OLPCGames and tutorial development. So far I'm very impressed, installed perfectly, and once I blew away my sugar-jhbuild (that seemed to confuse it), I got a very functional environment for development.

At the moment this is by far the easiest path to a working development environment I've found. Ubuntu installation, add a repository to your apt-get sources and then get three packages (which pulls in lots of other packages). Haven't tried un-installing, nor upgrading, but all in all I'm very happy with the resulting environment.