Just took a deeper look at the source code, file:

 /usr/lib/python2.4/site-packages/UpdateManager/MetaRelease.py

Add at the end of this file, in the download exception code: 
self.metarelease_information=f
Otherwise, stays to None after object initialisation, the check() procedure 
then does not parse() the release file.

The end of this file appears now:

        except urllib2.URLError:
            if os.path.exists(self.METARELEASE_FILE):
                f=open(self.METARELEASE_FILE,"r")
                self.metarelease_information=f

This does the trick for me.

-- 
update-manager does not offer option to upgrade to Feisty
https://bugs.launchpad.net/bugs/108363
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