This bug is present in Jaunty.  I am behind a proxy and use ntlmaps-0.9.9.0.1 
to get through our corporate proxy.
Normal updates function correctly thru the proxy.

update-manager version = 1:0.111.10

update-manager does not show an upgrade option 'button'
Software Sources >> Updates >> Release upgrade is selected to "Normal releases"

$ sudo env | grep http_proxy; sudo /usr/bin/do-release-upgrade
http_proxy=http://127.0.0.1:5865/         <== my ntlmaps proxy
Checking for a new ubuntu release
No new release found

Is there a workaround for upgrading from jaunty to karmic?
an apt file to edit?  global replace jaunty with karmic ?

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version upgrade via update-manager or do-release-upgrade does not work with 
proxy authentication
https://bugs.launchpad.net/bugs/479391
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