Thanks for your bugreport.
What is the output of:
$ tail -n25 ~/.cache/update-manager-core/meta-release-development
Does it help if you run:
$ http_proxy="" update-manager -d
?
This may be a proxy issue, the code uses if-modified-since http headers.
** Changed in: update-manager (Ubuntu Natty)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/756763
Title:
Xubuntu: update-manager -d fails to allow upgrade from 10.10
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