I run ubuntu on a few machines, but this release is not looking that great in many respects. Cosmetically I think it is one of their weakest releases yet, but more importantly no time has been spend on important things such as the raid subsystem, so lucid will ship with the same old version of mdadm as karmic (~18 months old) and many other problems related to the raid. No problem if you don't use software raid, but if you do, you are currently better of with debian testing or another linux distribution.
