So currently charmhub only supports ubuntu series, I think the error message could be improved to help with the error, but it's hard to understand what you want when the prometheus-node-exporter charm doesn't have a default series.
So currently charmhub only supports ubuntu series, I think the error message could be improved to help with the error, but it's hard to understand what you want when the prometheus- node-exporter charm doesn't have a default series.