Este es mi actual fichero /etc/apt/source.list para Kubuntu 5.10 Release

## Breezy 5.10 Release ##
deb ftp://ftp.um.es/mirror/ubuntu breezy main restricted universe multiverse
deb ftp://ftp.um.es/mirror/ubuntu breezy-security main restricted universe multiverse
deb ftp://ftp.um.es/mirror/ubuntu breezy-updates main restricted universe multiverse

## KDE ##
deb http://kubuntu.org/packages/kde352 breezy main # KDE 3.5.1
deb http://kubuntu.org/packages/amarok-1.3.8 breezy main #Amarok 1.3.8
deb http://kubuntu.org/packages/koffice-15rc1 breezy main #KOffice 1.5 rc1

## Breezy Backports ##
deb http://archive.ubuntu.com/ubuntu breezy-backports main restricted universe multiverse
deb http://ubuntu-backports.mirrormax.net/ breezy-extras main restricted universe multiverse

Sources (/etc/apt/source.list) para Kubuntu 5.04 Release, tal vez algunos repositorios no esten mantenidos :-(

## KDE ##
deb http://kubuntu.org/packages/hoary-kde343/ hoary main
deb http://kubuntu.org/hoary-koffice141 hoary-updates main

## Hoary 5.04 Release ##
#deb ftp://ftp.ubuntu-es.org/ubuntu hoary main restricted universe multiverse
#deb ftp://ftp.ubuntu-es.org/ubuntu hoary-security main restricted
#deb ftp://ftp.ubuntu-es.org/ubuntu hoary-updates main restricted universe multiverse

deb ftp://ftp.um.es/mirror/ubuntu hoary main restricted universe multiverse
deb ftp://ftp.um.es/mirror/ubuntu hoary-security main restricted
deb ftp://ftp.um.es/mirror/ubuntu hoary-updates main restricted universe multiverse

## Hoary Backports ##
deb http://archive.ubuntu.com/ubuntu hoary-backports main universe multiverse restricted
#deb http://backports.ubuntuforums.org/ubp hoary-backports main universe multiverse restricted
#deb http://backports.ubuntuforums.org/ubp hoary-extras main universe multiverse restricted

#deb ftp://ftp2.caliu.info/backports/ hoary-backports main universe multiverse restricted
#deb ftp://ftp2.caliu.info/backports/ hoary-extras main universe multiverse restricted

## Sun Java 1.5 ##
deb http://ubuntu.tower-net.de/ubuntu/ hoary java

## Actualizaciones Kubuntu ##
deb http://kubuntu.org/ hoary-updates main