Just upgraded my desktop from 9.04 to 10.04LTS. I’d skipped 9.10 because of the [Intel graphics shenangigans](http://ubuntuforums.org/showthread.php?t=1130582) – there’s 133 pages to that thread – gives some idea of the level of aggro that seemed to be involved!
And today’s upgrade died horribly part way through with dependencies it couldn’t sort out…