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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, 20.0.5): 20.0.7.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.4): PHP 7.3
The issue you are facing:
There was a php-Error so I can’t access WebUI etc.
So I run update-Process and was hoping the php-Error would go away. Now the installation of Update is stuck at:
Doctrine\DBAL\Exception\DriverException: An exception occurred while executing ‘SELECT DISTINCT k.CONSTRAINT_NAME, k.COLUMN_NAME, k.REFERENCED_TABLE_NAME, k.REFERENCED_COLUMN_NAME /*!50116 , c.update_rule, c.delete_rule / FROM information_schema.key_column_usage k /!50116 INNER JOIN information_schema.referential_constraints c ON c.constraint_name = k.constraint_name AND c.table_name = ‘oc_notes_meta’ / WHERE k.table_name = ‘oc_notes_meta’ AND k.table_schema = ‘nextcloud’ /!50116 AND c.constraint_schema = ‘nextcloud’ */ AND k.REFERENCED_COLUMN_NAME is not NULL’:
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
After reading the whole Internet and finding some things about enabling the mysql 4-byte I followed the steps and the result was:
…
In AbstractMySQLDriver.php line 106:
An exception occurred while executing ‘SELECT id FROM oc_jobs WHERE (c lass = ?) AND (argument = ?) LIMIT 1’ with params [“OC\Preview\Backgro
undCleanupJob”, “null”]:
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
In PDOStatement.php line 129:
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
In PDOStatement.php line 127:
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- run sudo -u www-data php /var/www/nextcloud/updater/updater.phar
The output of your Nextcloud log in Admin > Logging:
Can't access
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => ':-)',
'secret' => ':-)',
'trusted_domains' =>
array (
0 => 'localhost',
5 => 'nextcloudpi.local',
7 => 'nextcloudpi',
8 => 'nextcloudpi.lan',
1 => ':-)',
11 => ':-)',
3 => ':-)',
12 => ':-)',
),
'datadirectory' => '/media/myCloudDrive/ncdata',
'dbtype' => 'mysql',
'version' => '20.0.5.2',
'overwrite.cli.url' => ':-)',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ncadmin',
'dbpassword' => ':-)',
'installed' => true,
'instanceid' => 'ochvelgsn5v1',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => 0,
'timeout' => 0.0,
'password' => ':-)',
),
'tempdirectory' => '/media/myCloudDrive/ncdata/tmp',
'mail_smtpmode' => 'sendmail',
'mail_smtpauthtype' => 'LOGIN',
'mail_from_address' => 'admin',
'mail_domain' => 'ownyourbits.com',
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'overwriteprotocol' => 'https',
'maintenance' => false,
'logfile' => '/media/myCloudDrive/ncdata/nextcloud.log',
'loglevel' => '2',
'log_type' => 'file',
'htaccess.RewriteBase' => '/',
'theme' => '',
);
The output of your Apache/nginx/system log in /var/log/____:
can't find it