When already running build 5608 (without Parallels Tools, that couldn't be installed), I was careless enough to follow instructions from a person from Parallels/Support, and try Build 5604 to solve the Parallels Tools issue. It did solve the Parallels Tools issue, that got installed, but the whole Ubuntu 8.04 that I had succeeded to build and run smoothly, albeit without Parallels Tools went to h...: the short version is that nothing, absolutely nothing worked any more, I couldn't launch most applications, and the few ones I could launch didn't do what they are supposed to do. I uninstalled Parallels Tools, and went back to build 5608. I could repair some of the damage, but it is still NOT the 8.04 I was running before the 5604 adventure. Lesson, as old as creation itself: "If it ain't broken, don't fix it". I am hoping and waiting for a Parallels build that will fully, but I mean fully support Ubuntu 8.04, including Coherence. I run Windows XP Professional SP3 under build 5608, it works perfectly, and I expect Parallels will release a build that will enable user to run Ubuntu 8.04, as well as Windows, before "Parallels 4.0", which will probably be a paying upgrade.