sentence: ubuntu 7.04 included several new features , among them a migration assistant to help former microsoft windows users transition to ubuntu , support for kernel-based virtual machine , assisted codec and restricted drivers installation including adobe flash , java , mp3 support , easier installation of nvidia and ati drivers , compiz desktop effects , support for wi-fi protected access , the addition of sudoku and chess , a disk usage analyzer ( baobab ) , gnome control center , and zeroconf support for many devices .