I should probably have mentioned that the end result is that, if you're
behind a firewall, after clicking the "Upgrade" button to start a
distribution upgrade, the Update Manager appears to hang. The reason is
that it's sitting in url_downloadable, waiting for the connection to
time out.
Correctin
Public bug reported:
Binary package hint: update-manager
When updating to 9.10 from from 9.04, the update-manager uses a utility
function called "UpdateManager.Core.utils.url_downloadable". This
function skips urllib2 - which is properly configured to use the proxy
settings - and instead directly
