Posta il sorces.list , l'installazione l'inux se le repo ci sono tutte va a buon fine senza errori .

deb http://ftp.it.debian.org/debian/ lenny main contrib non-free
deb http://security.debian.org/ lenny/updates main contrib non-free
deb http://www.debian-multimedia.org/ lenny main

con molta probabilita se completi aggiungendo sid e experimental risolvi l' installazione , senza bisogno di manovre astruse.
Questo è il mio sorcio e va divinamente senza crearmi nessun problema:

# deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 xfce-CD Binary-1 20070407-12:12]/ etch contrib main

# deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 xfce-CD Binary-1 20070407-12:12]/ etch contrib main

deb http://ftp.it.debian.org/debian/ sid main contrib non-free
deb http://ftp.it.debian.org/debian/ experimental main contrib non-free

deb http://security.debian.org/ lenny/updates main contrib non-free
# deb-src http://security.debian.org/ etch/updates main contrib


deb http://www.debian-multimedia.org/ experimental main
deb http://www.debian-multimedia.org/ sid main
deb http://www.debian-multimedia.org/ lenny main
deb http://ftp.it.debian.org/debian/ lenny main contrib non-free


Per installare son partito dal cdrom xfce-base completo.