I also confirm that the problem is (meanwhile?) independent of a proxy
having authentication or not. I tested both cases.
do-release-upgrade works (!), but it needs ages directly after the
start. In my opinion it is waiting for a timeout.
The problem lies still in url_downloadable. If this function returns
false, do-release-upgrade falls back to the main server. The remaining
part of the application runs happily (and fast) with that fallback.
url_downloadable seems to block on some systems, waiting for a timeout.
Thus it may last a very long time before the programm continoues. Maybe
this depends on the network or the proxy or its configuration.
The fallback code exists in _expandUri. Modifiying the code that it
always just returns the fallback server (= it doesn't use
url_downloadable directly or indirectly anymore) resolves the problem
immediately.
The patch from Thomas (#5) also works, but in my opinion it removes the
support of ftp uris?
** Changed in: update-manager (Ubuntu Lucid)
Status: Incomplete => Confirmed
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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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