Thanks for your report.
It looks like you've installed python-apt from a ppa
(0.7.13.2ubuntu4.1launchpad1) So update-manager legitimately refuses to
upgrade it. Install the version from the official Ubuntu repository and
try performing the upgrade again.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
--
"The upgrade is now aborted"
https://bugs.launchpad.net/bugs/571975
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