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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, 29.0.5): 25.013
Operating system and version (eg, Ubuntu 24.04): 22.04 Apache or nginx version _(eg, Apache 2.4.25)_: 2.4.52
PHP version (eg, 8.3): php8.1
The issue you are facing:
after updating Linux Ubuntu to 22.04 LTS,
Nextcloud is not starting. i get an error in the apache2 log:
[Thu Aug 29 14:01:44.054500 2024] [php7:error] [pid 1965910] [client 192.168.56.230:64792] PHP Fatal error: Uncaught Doctrine\\DBAL\\Exception: Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] No such file or directory in /var/www/nextcloud/lib/private/DB/Connection.php:139\nStack trace:\n#0 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1519): OC\\DB\\Connection->connect()\n#1 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1041): Doctrine\\DBAL\\Connection->getWrappedConnection()\n#2 /var/www/nextcloud/lib/private/DB/Connection.php(261): Doctrine\\DBAL\\Connection->executeQuery()\n#3 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(345): OC\\DB\\Connection->executeQuery()\n#4 /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(281): Doctrine\\DBAL\\Query\\QueryBuilder->execute()\n#5 /var/www/nextcloud/lib/private/AppConfig.php(419): OC\\DB\\QueryBuilder\\QueryBuilder->execute()\n#6 /var/www/nextcloud/lib/private/AppConfig.php(184): OC\\AppConfig->loadConfigValues()\n#7 /var/www/nextcloud/lib/private/AppConfig.php(375): OC\\AppConfig->ge in /var/www/nextcloud/lib/private/DB/Connection.php on line 139
this error i got is similiar to this: Failed to connect to database after upgrade to Ubuntu 22.04.1 LTS
i’ve tried to do what based on that: a2enmod php8.1, but php8.1 is already enabled:
Considering dependency mpm_prefork for php8.1:
Considering conflict mpm_event for mpm_prefork:
Considering conflict mpm_worker for mpm_prefork:
Module mpm_prefork already enabled
Considering conflict php5 for php8.1:
Module php8.1 already enabled
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
No nextcloud log
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oc***REDACTED***',
'passwordsalt' => '***REDACTED***',
'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'drive.xxx.com',
1 => '192.168.45.9',
),
0 =>
array (
0 => '192.168.45.9',
),
'onlyoffice' =>
array (
'verify_peer_off' => true,
'jwt_secret' => '***REDACTED***',
'jwt_header' => 'AuthorizationJwt',
),
'datadirectory' => '/mnt/nc/new-nc',
'dbtype' => 'mysql',
'version' => '25.0.13.2',
'overwrite.cli.url' => 'http://192.168.45.9/nextcloud',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ncuser',
'dbpassword' => 'xxx',
'installed' => true,
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'allow_local_remote_servers' => true,
'mail_from_address' => 'nextcloud',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'xxx.com',
'mail_smtphost' => 'xxx',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpport' => '25',
'mail_smtpname' => 'nextcloud',
'mail_smtppassword' => 'xxx',
'updater.secret' => '***REDACTED***',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'has_rebuilt_cache' => true,
'log_type' => 'file',
'logfile' => '/var/log/nextcloud/nextcloud/log',
'updater.release.channel' => 'stable',
);
The output of your Apache/nginx/system log in /var/log/____:
none
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
[Thu Aug 29 14:01:44.054500 2024] [php7:error] [pid 1965910] [client 192.168.56.230:64792] PHP Fatal error: Uncaught Doctrine\\DBAL\\Exception: Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] No such file or directory in /var/www/nextcloud/lib/private/DB/Connection.php:139\nStack trace:\n#0 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1519): OC\\DB\\Connection->connect()\n#1 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1041): Doctrine\\DBAL\\Connection->getWrappedConnection()\n#2 /var/www/nextcloud/lib/private/DB/Connection.php(261): Doctrine\\DBAL\\Connection->executeQuery()\n#3 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(345): OC\\DB\\Connection->executeQuery()\n#4 /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(281): Doctrine\\DBAL\\Query\\QueryBuilder->execute()\n#5 /var/www/nextcloud/lib/private/AppConfig.php(419): OC\\DB\\QueryBuilder\\QueryBuilder->execute()\n#6 /var/www/nextcloud/lib/private/AppConfig.php(184): OC\\AppConfig->loadConfigValues()\n#7 /var/www/nextcloud/lib/private/AppConfig.php(375): OC\\AppConfig->ge in /var/www/nextcloud/lib/private/DB/Connection.php on line 139`
thanks a lot.