rm -f "$rootdir/etc/apt/sources.list" "$rootdir/etc/apt/sources.list.d/*"
chroot "$rootdir" apt-get clean
umount "$rootdir/sys" || true
rm -f "$rootdir/etc/apt/sources.list" "$rootdir/etc/apt/sources.list.d/*"
chroot "$rootdir" apt-get clean
umount "$rootdir/sys" || true