i have a very similar problem.
i couldn’t use the automatic upgrade function (the package couldn’t be downloaded for whatever reasons), so i did a manual upgrade, which worked fine.
but i still get this message at the top saying “An automated WordPress update has failed to completed – please attempt the update again now.”
but there’s nothing to update! i tried an upgrade, but wp will just tell me, i’m up to date.
also the bottom of the page tells me, i’m using 2.7.1 and so does the wp-includes/version.php.
how can i just get rid of it?