Check that avahi-daemon is installed and running. Make sure that the machine knows its own name (try 'host machinename.local' from a terminal.
I recently updated my laptop to 14.10 and the name service stopped working on it. It turned out that my network favours IPv6 as I have it configured, and 14.10 disabled IPv6 support in avahi for some reason. -- Steel under us, power above us
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