Stuck in Maintenance Mode after web update

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Nextcloud version (eg, 20.0.5): 25.0.2
Operating system and version (eg, Ubuntu 20.04): ? (web hoster)
Apache or nginx version (eg, Apache 2.4.25): ? (web hoster)
PHP version (eg, 7.4): 8.1

The issue you are facing:
I started an update from NCv25.0.2 to NCv25.0.3 vi the web updater.
My NC instance is stuck in Maintenance mode.
Unfortunately I only have FTP access to NC, wehre I tried already the following:

  1. .user.ini
  2. config.php
    ‘maintenance’ => false,

But no success. I am stuck in maintenance mode.

Is this the first time you’ve seen this error? Y:
In the past I this happened to me as well, but resetting the maintenance flag in config.php (several times) helped me out of this situation.

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

$CONFIG = array (
  'instanceid' => 'xxxxxxxxxxxxxxxxx',
  'passwordsalt' => 'xxxxxxxxxxxxxxxxxxxxxxxx',
  'secret' => 'rxxxxxxxxxxxxxxxxxxxxx',
  'trusted_domains' => 
  array (
    0 => '',
    1 => '',
  'datadirectory' => '/www/htdocs/',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' => '',
  'dbname' => 'dxxxxxxxxx',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'xxxxxxxx',
  'mysql.utf8mb4' => true,
  'dbuser' => 'xxxxxxxxx',
  'dbpassword' => 'xxxxxxxxxxxxx',
  'installed' => true,
  'tempdirectory' => '/www/htdocs/xxxxxxxxxxxxx/data/tmp/',
  'mail_smtpmode' => 'sendmail',
  'mail_sendmailmode' => 'pipe',
  'mail_from_address' => 'xxxxxxx',
  'mail_domain' => 'xxxxxxx',
  'default_phone_region' => 'DE',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 0,
  'app_install_overwrite' => 
  array (
    0 => 'calendar',
  'updater.secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxx,

Update to 25.0.3

An error occurred.
Detailed logs

Preparing update

Set log level to debug

Turned on maintenance mode

Repair step: Repair MySQL collation

Repair info: All tables already have the correct collation → nothing to do

Repair step: Repair SQLite autoincrement

Repair step: Copy data from accounts table when migrating from ownCloud

Repair step: Drop account terms table when migrating from ownCloud

Updating database schema

Updated database

An error occurred.

There is a chance that there is more information in the logs. Updating database stuff is probably th e most critical but this seems to have worked.

I do have exatly the same problem:
It ends with:
"Updated database

An error occurred."

error log is: debug.

—> Allowed memory size of 67108864 bytes exhausted!!

Thats it. 512M are not enough. I spend 768M, and it started again!