I had to download and install mp3 codecs from the XMMS site for em to work when i was using slack. Some copyright issues or something made them remove the codec and use the .ogg codec for music files.
i do have ubuntu in my collection but havent tried it yet since no space to install. why sudo command to login as root?? have u forgotten your password?
do u mean this comand when u are loged in as non-priviledged user:
^^ similar as RunAs in Windows 2000/XP
as for the media player i use Xine on FC3 with mplayer codec pack installed and it plays all files from divx,wmv,mp3,wma etc.