Thanks for oyur bugreport.
This looks like a typo in your sources.list "mai*l*" instead of "main".
Please correct that and see if that fixes the problem.
** Changed in: update-manager (Ubuntu)
Assignee: (unassigned) => Michael Vogt (mvo)
Status: New => Incomplete
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Failing update to 8.10
https://bugs.launchpad.net/bugs/291120
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