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[ubuntu] DNS lookup fails after 12.10 upgrade

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linux-howto

http://ubuntuforums.org – I upgraded to 12.10 yesterday and now I can't seem to resolve domain names. Connection Information seems to provide proper DNS server addresses from DHCP, but "ping" and "nslookup" both immediately fail with "unknown host" errors. I have tried external servers (google.com, ubuntu.com) as well as internal network host names, and none work. I can successfully ping IP addresses (internal and external). This occurs for both ethernet and wireless connections. Booting into Windows 7 on the same system does not have this problem. ()