I feel that I should elaborate. The final behavior that I'm looking for
is to have a DNS server with IPv6 address active in my system. This
means that an IPv6 address should be placed in /etc/resolv.conf. This
can happen in a number of ways:

* the user adds one manually (through resolvconf or Network Manager) - OK as a 
temporary solution, but does not scale well
* the dnsmasq server used by Ubuntu listens on IPv6 as well and the line 
"nameserver=::1" is added in /etc/resolv.conf - looks like the simplest 
solution to me
* the dnsmasq server used by Ubuntu does _not listen on IPv6_, and then the 
IPv6 server received by DHCPv6 (available in /run/nm-dns-dnsmasq.conf) is used 
in /etc/resolv.conf - this solution might need further changes in resolvconf 
and breaks the behavior designed in [1] for IPv6-only clients

[1] https://blueprints.launchpad.net/ubuntu/+spec/foundations-p-dns-
resolving

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https://bugs.launchpad.net/bugs/1010724

Title:
  No IPv6 nameservers in Ubuntu 12.04

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