if you're using it on a Debian/Ubuntu system without network-manager you will need to manually tell the script what IP address to use for DNS with __nameserver=
This is not designed to be used by end users - and you should use the other solution. Image generation parameters can be changed at any time also so what works today may not work tomorrow.
As I said :
It would be easier to just convert an existing image though probably and will be a lot quicker. eg https://github.com/Kingo71/BerryConverter
I can't help any further. We don't support berryboot.