On a fresh install this morning I got no response and eventually came
back into the room and saw a "failed to fetch...". I downgraded the same
computer back to the -ubuntu9 libc6 packages and used update manager to
download patches again a few times. The first two times it started
grabbing all the packages instantly. I stopped these downloads right
away; I assume they would have worked.

The third time it took about 3 minutes of lookup for each package, even though 
they are only fetched from a handful of domains (us.archive.ubuntu.com and 
security.ubuntu.com). During this time Update Manager spends most of the time 
showing "Download rate: unknown".  After it finished (last 2 packages failed) I 
got the message:
Some of the packages could not be retrieved from the server(s).
Do you want to continue, ignoring these packages?

The errors this time were:
W: Failed to fetch 
http://us.archive.ubuntu.com/ubuntu/pool/main/g/gnome-system-monitor/gnome-system-monitor_2.20.1-0ubuntu1_i386.deb
  Could not connect to us.archive.ubuntu.com:80 (1.0.0.0), connection timed out


W: Failed to fetch 
http://us.archive.ubuntu.com/ubuntu/pool/main/u/ubufox/ubufox_0.4~beta1-0ubuntu4_all.deb
  Could not connect to us.archive.ubuntu.com:80 (1.0.0.0), connection timed out

The fourth time everything failed, with packages failing every couple of
minutes, simultaneously for us... and security... The entire time the
download window shows (if the individual progress isn't open)
"Downloading file 1 of 25" "Download rate: unknown". After somewhere
between forty minutes and an hour I got:

An error occured
The following details are provided:

[The rest of the error message is attached; it's just failed to fetch
from 1.0.0.0 for every package]

A fifth attempt resulted in everything downloading again.

It's interesting how streaky the results are. It failed for everything
this morning, succeeded for the first couple dozen packages of testing
this afternoon, and then failed for the next 27 packages in a row, then
later this afternoon succeeded for all 25 packages. This wasn't due to
network issues; firefox with ipv6 disabled worked on the same computer
during the same time period.

For an individual packaged downloading it has three different
behaviours: download instantly, time-out and download successfully, and
time-out and fail / never download.

All together this is a very unpleasant user experience. It does not just
take a long time to get the upgrades to fix the problem, in a third of
my experience it failed to get any of the upgrades, and the behaviour
previously mentioned, "(a long timeout), DNS lookups do in fact succeed
after the delay. This means that it does not prevent updates from being
downloaded", being the least common result in my rather limited
experience and still didn't result in a complete set of patches.

I would describe this situation as being: Major feature (all dns
resolved networking) broken after install, security feature (security
updates) broken after install. Even with 50% or better of installations
fixing themselves on the first upgrade, and maybe 100% fixing themselves
with a persistently upgrading user who has faith that the upgrades will
solve his or her problem this is still a major problem present after
installing the system.

** Attachment added: "every package failing.txt"
   http://launchpadlibrarian.net/10303628/every%20package%20failing.txt

-- 
IPv6 link-local interface lookup fix regressed from Feisty to Gutsy
https://bugs.launchpad.net/bugs/156720
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