I was a bit desperate today, while trying to update my owncloud from version 8.2.1 to 8.2.2. I always got this message in red characters.
Update failed. Unable to move /DOCUMENTROOT/_oc-upgrade/8.2.2.2/core/resources to /DOCUMENTROOT/resources
First I thought the problems were wrong permissions, but the solution is much easier. The owncloud version number in the file
[DOCUMENTROOT]/owncloud/apps/updater/lib/location/core.php
must be 8.2 (see screenshot above)!
In my file it was 8.1. Just change it and start the update again, then it will work :)
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