OK, I think I might have found it. Looking through this <a
href="http://ubuntuforums.org/showthread.php?t=613521&page=2">thread</a>
it appears as though the local machine's entry in /etc/hosts is not
quite right. My /etc/hosts was originally:
127.0.0.1 localhost
127.0.1.1 Udesktop.example.com
And I changed it to:
127.0.0.1 localhost
127.0.0.1 Udesktop Udesktop.example.com
After this change I killed and restarted Update Manager and it worked
without problems. I'm guessing there should be a bug opened with Update
Manager so that if the hosts name cannot be determined it will at least
throw a dialog box up to complain. Hanging the system just because it
cant resolve its own name is not a good thing.
--
update manager hangs in hardy alpha 4
https://bugs.launchpad.net/bugs/188957
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