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For auto updating, the following permission changes usually work. Run these commands from within the WordPress root directory:

find . -type d -exec chmod 775 {} \;
find . -type f -exec chmod 664 {} \;

You may also need to add this directive to the wp-config.php file:

define('FS_METHOD', 'direct');

The webserver user may also need to own or be the group for all of the WordPress files:

chgrp -R apache *

Mor information on WordPress permissions: Changing File Permissions

SSL Bypass

Due to SSL vulnerabilities a lot of sites will disable older versions of SSL (as they should). This can cause some problems when updating if software that uses SSL is not upgraded.

As a temporary bypass for the SSL problem, this can be used: http://apipeandakeyboard.com/2015/09/16/download-failed-error0d0890a1asn1/