The package python-certbot-dns-rfc2136 4.0.0-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/python-certbot-dns-rfc2136 -- More information about python-certbot-dns-rfc2136: https://pkg.kali.org/pkg/python-certbot-dns-rfc2136