@Michael: Well, it is just simple authentication. Here's what i did:

$ sudo env | grep http_proxy; sudo /usr/bin/do-release-upgrade
[sudo] password for user: 
http_proxy=http://user:passw...@proxy.abc.de:3128/
Checking for a new ubuntu release
No new release found

If i modifiy the mentioned python script to print out the error code it
says 407.

A "wget http://changelogs.ubuntu.com/meta-release"; works without
problems.

-- 
url_downloadable ignores proxy settings
https://bugs.launchpad.net/bugs/446552
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