I have installed 9.10 beta when it came out and I don't have too much trouble with it too far. Apart for the fact that some software are half or not translated yet (in French).
This procedure is intended for people who wants to upgrade from an existing Ubuntu 9.04 hard drive install. If instead you want to upgrade (or do a fresh install) using Ubuntu 9.10 Deskto
You will find here a repackaged .deb archive that includes the missing shared libraries and simlinks necessary for MainActor 5.5 to work on Ubuntu 8.04, 8.10, 9.04 and 9.10 (32/64 bits).