All i can say is i have never sucsessfully upgraded between versions on ubuntu without somthng being broken (somtimes that somthing is as key as X11 or gnome)
ive never had any problems with a clean install so thats what im planning to do when i have some spare time,
(i keep 2 partitions for ubuntu, currently one has 8.10 and one has 9.04, but these will change to 9.10 and 9.04)
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