As far my understanding, in the current context of Ubuntu 11.04 Lucid Lynx we have a greatest change in desktop. We had our beautiful gnome look but with the updates to 11.04 Lucid Lynx, we will not see the default gnome look but we will be seeing Unity. Unity was famous in net-book editions. As the unity are not completely stable, so you may have been facing problem. So, for your beautiful to get back, here you what you have to do.