problem using amarok

[Luca Ferrari]

On Friday 20 April 2007 Eamonn Sullivan's cat, walking on the keyboard, wrote:
> I've seen that behaviour when I don't have the correct codecs to play
> the song. I'm afraid I don't know what you need to install for the
> (KDE-based) Amarok to play MP3s, but I'm sure someone does.

My distro is a kubuntu 6.1, and the mp3 are played well with xmms, thus I 
guess I've got already the codec. I've tried to install the 
ubuntu-restricted-extras but it does not work, or better it does not find the 
package:

root at fluca:~# apt-get install ubuntu-restricted-extras
Lettura della lista dei pacchetti in corso... Fatto
Generazione dell'albero delle dipendenze in corso
Reading state information... Fatto
E: Impossibile trovare ubuntu-restricted-extras


Maybe I'm missing a repository in the source list? The following is my 
source.list file:


# Ubuntu supported packages
# GPG key: 437D05B5
deb http://it.archive.ubuntu.com/ubuntu edgy main restricted
deb http://it.archive.ubuntu.com/ubuntu edgy-updates main restricted
deb http://security.ubuntu.com/ubuntu edgy-security main restricted

# Ubuntu community supported packages
# GPG key: 437D05B5
deb http://it.archive.ubuntu.com/ubuntu edgy universe multiverse
deb http://it.archive.ubuntu.com/ubuntu edgy-updates universe multiverse
deb http://security.ubuntu.com/ubuntu edgy-security universe multiverse

# Seveas' Ubuntu Packages
# GPG key: 1135D466
deb http://seveas.imbrandon.com edgy-seveas all

# Kubuntu.org bleeding edge KDE
# GPG key: DD4D5088
deb http://kubuntu.org/packages/kde-latest edgy main

# Kubuntu.org bleeding edge Koffice
# GPG key: DD4D5088
deb http://kubuntu.org/packages/koffice-latest edgy main

# Kubuntu.org bleeding edge amaroK
# GPG key: DD4D5088
deb http://kubuntu.org/packages/amarok-latest edgy main

# Upstream Wine
# GPG key: 387EE263
deb http://wine.budgetdedicated.com/apt edgy main

# Upstream Beryl
# GPG key: ed8a569e
deb http://www.beerorkid.com/compiz edgy main-edgy

# Medibuntu multimedia packages
# GPG key: 0C5A2783
deb http://medibuntu.sos-sts.com/repo/ edgy free non-free

# Canonical Commercial packages
# GPG key: 437D05B5
deb http://archive.canonical.com edgy-commercial main


Any idea?