The problem could be simply that the symbolic link at /etc/resolv.conf
is missing. This should be a symbolic link with value
"../run/resolvconf/resolv.conf".  Create it by doing

    ln -nsf ../run/resolvconf/resolv.conf /etc/resolv.conf

and then rebooting.  After rebooting do the following in a terminal

    ls -l /etc/resolv.conf
    cat /etc/resolv.conf
    ls -l /run/resolvconf
    ls -l /run/resolvconf/interface
    for F in /run/resolvconf/interface/* ; do echo === $F === ; cat $F ; done
    ls -l /etc/resolvconf/resolv.conf.d
    for F in /etc/resolvconf/resolv.conf.d/* ; do echo === $F === ; cat $F ; 
done
    cat /etc/NetworkManager/NetworkManager.conf
    ps -elfww|grep dnsmasq

and post the results here.

** Summary changed:

- No DNS resolution after upgrade from 12.04 to 12.10 beta
+ No resolving after upgrade from 12.04 to 12.10 beta

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https://bugs.launchpad.net/bugs/1051348

Title:
  No resolving after upgrade from 12.04 to 12.10 beta

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