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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 18.0.6
Operating system and version (eg, Ubuntu 20.04): OpenSuse Leap 15.2
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.43 (Linux/SUSE)
PHP version (eg, 7.1): 7.4.6 (cli)
The issue you are facing:
Update failed while using Web-Updater. Updated get stuck at point “Deleting old files”. Opening NC-website now shows “Update in process”.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Call website URL
- Trying to set maintenance mode to “off” and restart upgrade via OCC results “Nextcloud is already latest version”
The output of your Nextcloud log in Admin > Logging:
not accessable
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxx',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => 'nextcloud.xxx.xxx',
),
'datadirectory' => '/srv/nextcloud_data',
'dbtype' => 'mysql',
'version' => '18.0.6.0',
'overwrite.cli.url' => 'https://nextcloud.xxx.xxx',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxx',
'dbpassword' => 'xxx',
'installed' => true,
'has_rebuilt_cache' => true,
'maintenance' => true,
'theme' => '',
'loglevel' => 2,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'xxx',
'mail_domain' => 'xxx',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'xxx',
'mail_smtpport' => '587',
'mail_smtpname' => 'xxx',
'mail_smtppassword' => 'xxx',
'updater.secret' => 'xxx',
);
Updater-Log:
The output of your Apache/nginx/system log in /var/log/apache2/:
no special entries for update time
Running
sudo -u wwwrun php ./occ update:check
shows
Nextcloud 18.0.7 is available. Get more information on how to update at https://docs.nextcloud.com/server/18/admin_manual/maintenance/upgrade.html.
1 update available
But when I now try to run
sudo -u wwwrun php updater.phar
nothing happens. No output on the command line.
How can I re-run the upgrade or revert the done steps to bring NC live again?
Thanks,
Lemming
