I have no confirmation but it seems to be caused by a host at
archive.canonical.com being slow to respond.

I have no firewall blocking data files from being downloaded and use a proxy 
that doesn't cache tar.gz files.
>From the logs of the proxy, response time from archive.canonical.com was 241s, 
>then 49s on next try (file being downloaded was 
>adobe-flashplugin_11.2.202.233.orig.tar.gz)

I ran 100 iterations of the following command today with and without proxy:
rm /var/lib/update-notifier/package-data-downloads/flashplugin-installer; 
apt-get install --reinstall update-notifier-common

None of them failed and I couldn't reproduce the hang. Average response
times are below 5s for scandium.canonical.com and between 7s and 10s for
sadalbari.canonical.com.

Here is an excerpt of my proxy's logs for yesterdays tries:
TimeStamp    ResponseTime (ms)    Peer
2012-04-17 11:14:07 240914 91.189.92.191
2012-04-17 11:19:42  49232 91.189.92.191
2012-04-17 11:34:11   4364 91.189.88.33
2012-04-17 11:39:13   4591 91.189.88.33
2012-04-17 11:49:27   4501 91.189.88.33
2012-04-17 12:07:56   8955 91.189.92.191
2012-04-17 13:02:37  10554 91.189.92.191

My guess is that remote host was slow to respond/unresponsive which
froze the downloader.

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https://bugs.launchpad.net/bugs/984373

Title:
  update-notifier setup hangs during installation of Precise with
  ubiquity

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