So, I seem to have found a workaround for my case:

1: Configure my IPv6 router to only advertise the correct prefix rather than a 
correct one and a bogus one.
2: Reconfigure the IPv6 method on my "Auto eth0" network connection in 
NetworkManager to "Automatic, addresses only" instead of "Ignore".

I think the first of those was the critical one; the second just forced
my Ubuntu box to pick up the change.

Having done those, the upgrade gets as far as asking me to shut down all
applications, which it didn't before.

It seems to me that there's still a bug here -- a broken network should
not cause update-manager to ask me to file a bug report.

-- 
upgrate to 10.10 causes error ubuntu-minimal missing
https://bugs.launchpad.net/bugs/657812
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