New answers tagged auto-update
This may be due to a plugin. Try deactivating all plugins by using the plugin screen select all and use the bulk action to disable all. Afterwhich try installing the WP update again and it should work assuming that this was wotking before and it recently stopped.
You may want to check what the Codex recommends for file permissions vs. what you are using. http://codex.wordpress.org/Changing_File_Permissions
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