Updater stuck on initializing

Nextcloud version (eg, 12.0.2): 12.0.3
Operating system and version (eg, Ubuntu 17.04): Ubuntu 17.04
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.18 (Ubuntu)
PHP version (eg, 7.1): 7.0.28
MySql: 5.7.22

The issue you are facing:

Whenever I start the updater from the administartor panel It displays the remark: Initializing and it shows the version number: 12.0.3.
Nothing else happens and there is nothing in the logging.

Is this the first time you’ve seen this error? (Y/N): No

Steps to replicate it:

  1. Just press open updater from admin panel

The output of your Nextcloud log in Admin > Logging:

PASTE HERE

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

NONE!
root@srv01:/var/www/nc/config# more config.php
<?php
$CONFIG = array (
  'instanceid' => 'xxx',
  'passwordsalt' => 'xxx',
  'secret' => 'xxx',
  'trusted_domains' =>
  array (
    0 => 'xxx.nl',
  ),
  'datadirectory' => '/xxx/',
  'overwrite.cli.url' => 'http://xxx.nl', (https? http is not working...)
  'dbtype' => 'mysql',
  'version' => '12.0.3.3',
  'dbname' => 'NextCloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'mail_smtpmode' => 'php',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_from_address' => 'dpkweb.nl',
  'mail_domain' => 'xxx',
  'mail_smtphost' => 'xxx',
  'mail_smtpport' => 'xxx',
  'mail_smtpauth' => 1,
  'mail_smtpname' => 'xxx',
  'mail_smtppassword' => 'xxx',
  'mail_smtpsecure' => 'ssl',
  'updater.release.channel' => 'stable',
  'updater.secret' => 'xxx',
);