Following:mvance posts on Nginx. I am using a Nginx and older OC 8.2.9
sudo -u www-data php /var/www/owncloud/occ upgrade
ownCloud is in maintenance mode - no app have been loaded
ownCloud is in maintenance mode
Maybe an upgrade is already in process. Please check the logfile (data/owncloud.log).
If you want to re-run the upgrade procedure, remove the “maintenance mode” from config.php and call this script again.
Need some help.