-# check if we already use an external mirror
-grep -q "external mirror" $target/etc/apt/sources.list && exit 0
-
-cat <<EOM > $target/etc/apt/sources.list
-# external mirror
-deb $ubuntumirror/ubuntu $ubuntudist main restricted universe multiverse
-deb $ubuntumirror/ubuntu $ubuntudist-updates main restricted universe multiverse
-deb $ubuntumirror/ubuntu $ubuntudist-security main restricted universe multiverse
-EOM