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