root@pluto:/etc/apt# ls
apt.conf    backup       sources.list    trustdb.gpg  trusted.gpg~
apt.conf.d  secring.gpg  sources.list.d  trusted.gpg


root@pluto:/etc/apt# cat sources.list
## EOL upgrade sources.list
# Required
deb http://old-releases.ubuntu.com/ubuntu/ dapper main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ dapper-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ dapper-security main restricted universe multiverse
# Optional
#deb http://old-releases.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse



root@pluto:/etc/apt# cat sources.list.d/prerequists-sources.dapper.list
# sources.list fragment for pre-requists (mirror from sources.list + fallback)
# this is safe to remove after the upgrade
deb http://old-releases.ubuntu.com/ubuntu/ dapper-backports main/debian-installer
deb http://old-releases.ubuntu.com/ubuntu/ dapper-backports main/debian-installer
deb http://old-releases.ubuntu.com/ubuntu/ dapper-backports main/debian-installer

deb http://archive.ubuntu.com/ubuntu dapper-backports main/debian-installer
root@pluto:/etc/apt#