deb http://MIRRORHOST/ubuntu natty main restricted universe
deb-src http://MIRRORHOST/ubuntu natty main restricted universe
deb http://MIRRORHOST/ubuntu natty-updates main restricted universe
deb-src http://MIRRORHOST/ubuntu natty-updates main restricted universe
deb http://MIRRORHOST/ubuntu-security natty-security main restricted universe
deb-src http://MIRRORHOST/ubuntu-security natty-security main restricted universe