Comment 14 for bug 1215961

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Scott Kitterman (kitterman) wrote :

OK, I can cause AttributeError: 'NoneType' object has no attribute 'header' by having an empty list of nameservers. So I think your problem is the python3-dns isn't, for some reason, discovering a usable nameserver.

What is in your /etc/resolv.conf and /etc/network/interfaces?

I also think py3dns should handle this better.