Is it possible, that some patch changed the usage order of the
nameserver from /etc/resolv.conf?

My router does deliver a "dead" nameserver via DHCP [1], which was never
a problem since Ubuntu used to question the first (local) nameserver.
The local nameserver resolves any given request without a problem [2].
If I remove the dead nameserver from resolv.conf, I no longer have any
problems resolving DNS queries.

So it *might* be a solution to just change the usage order of the DNS
servers to solve this "bug". Please notice, that a lot of users never
experienced this problem before Karmic, so it might be hard to blame
their hardware for this, even if it might be technically true... :-)

[1] It's a SE515, which delivers 217.237.151.97, despite any configuration. 
[2]  dig @192.168.1.1 www.microsoft.com AAAA without any noticeable delay

-- 
[karmic regression] all network apps / browsers suffer from multi-second delays 
by default due to IPv6 DNS lookups
https://bugs.launchpad.net/bugs/417757
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