Thanks for your bugreport.
Please update to update-manager 0.57.2. This should fix the problem.
Thanks,
Michael
** Changed in: update-manager (Ubuntu)
Assignee: (unassigned) => Michael Vogt
Status: Unconfirmed => Fix Released
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while performing distribution upgrade, a fatal error
Could you tell us from which Ubuntu version to which one were you
upgrading, and how did you do it?
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while performing distribution upgrade, a fatal error occured
https://launchpad.net/bugs/84995
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