Update from 16.x from WEB page failed

Nextcloud version: 16.0.5
Operating system and version: CentOS Linux release 7.7.1908 (Core)
Apache or nginx version : httpd-2.4.6-90.el7.centos
PHP version: 7.1.33

The issue you are facing:
Is this the first time you’ve seen this error? : Y

Steps to replicate it: Upgrade via WEB Interface

The output of your Nextcloud log in Admin > Logging:

??  I don't have access to WEB interface anymore, i have : "Update in process"  But, with command line:

sudo -u apache php ./occ upgrade
Nextcloud is already latest version

The CONTENT of your config.php file:
<?php $CONFIG = array ( 'instanceid' => 'oc5alhi6kkv9', 'passwordsalt' => '[REMOVED]', 'secret' => '[REMOVED]', 'trusted_domains' => array ( 0 => '[REMOVED]', 1 => 'nextcloud.[REMOVED].com', ), 'datadirectory' => '/var/www/html/nextcloud/data', 'overwrite.cli.url' => 'http://[REMOVED]/nextcloud', 'dbtype' => 'mysql', 'version' => '', 'dbname' => 'nextclouddb', 'dbhost' => 'localhost', 'dbport' => '', 'dbtableprefix' => 'oc_', 'dbuser' => 'ncusr', 'dbpassword' => '[REMOVED]', 'installed' => true, 'maintenance' => false, 'theme' => '', 'loglevel' => 2, 'mail_from_address' => 'admin', 'mail_smtpmode' => 'php', 'mail_smtpauthtype' => 'LOGIN', 'mail_domain' => '[REMOVED].com', 'updater.secret' => '[REMOVED]', ); ``` The output of your Apache/nginx/system log in `/var/log/____ ``` Which log do you want??? ``` So, i read on the net i could download the latest version and just extract over the existing directory. Well, i'm not sure it is really the thing to do. The WEB update stuck a couple of times saying "can't delete ...apps..." something. But priore to update, i did a hardlinked copy. Being stuck with no "cancel" button or anything, i just stopped apache, deleted the screwed directory and brung back the original one. BUT, a couple of days after, i got the infamous "Update in process." Now, i'm stuck/lost and don't know what to do...