What ALL can cause “Another update is currently in progress.”? [closed]

It should last more than 15 minutes. See if there is .maintenance folder in WordPress installation folder or execute following command from wp-cli

$ wp option delete core_updater.lock

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)