root@localhost:~# cat /etc/apt/sources.list
# deb http://us.archive.ubuntu.com/ubuntu natty main restricted
# deb http://us.archive.ubuntu.com/ubuntu natty-updates main restricted universe
# deb http://us.archive.ubuntu.com/ubuntu natty-security main restricted universe
deb http://archive.ubuntu.com/ubuntu precise main restricted
deb http://archive.ubuntu.com/ubuntu precise-updates main restricted
deb http://security.ubuntu.com/ubuntu/ precise-security main restricted
deb http://old-releaes.ubuntu.com/ubuntu natty universe