Ubuntu 11.04 Beta 1 has been released today and iso images are now available to download. Ubuntu 11.04, is coming up with an entirely new shell for Gnome desktop - Unity, which was default for netbook edition in Ubuntu 10.10 and was based on Mutter.However, Unity has been ported to Compiz from mutter. Classic Gnome Desktop will also be available in Ubuntu 11.04 but will not be default and users can switch to it from login screen.Netbook Edition of Ubuntu has been merged and now there is no 'Ubuntu Desktop Edition' or 'Ubuntu Netbook Edition'. Ubuntu's Unity interface will automatically detect netbooks and small screen devices and will adjust settings accordingly.