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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): 28.0.10
Operating system and version (eg, Ubuntu 24.04): Fedora 40
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.62
PHP version (eg, 8.3): 8.1.30
The issue you are facing:
Just upgraded to Fedora 40. It broke Nextcloud. Updating Nextcloud showed me this error:
An unhandled exception has been thrown:
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/html/nextcloud/lib/private/DB/Connection.php:150
Is this the first time you’ve seen this error? (Y/N):
Yes
Steps to replicate it:
- Upgrade to Fedora 40
- Run
sudo -u apache php --define apc.enable_cli=1 updater.phar
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!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxx',
'passwordsalt' => 'xxxxxx',
'secret' => 'xxxxx,
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'xxxxxxxxxxx
),
'datadirectory' => '/xxx/xxxxxx/data',
'dbtype' => 'mysql',
'version' => '28.0.4.1',
'overwrite.cli.url' => 'http://localhost/nextcloud',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxxxx',
'dbpassword' => 'xxxxxx',
'installed' => true,
'maintenance' => true,
'theme' => '',
'loglevel' => 2,
'data-fingerprint' => 'xxxxx',
'filesystem_check_changes' => 0,
'memcache.local' => '\\OC\\Memcache\\APCu',
'enable_previews' => true,
'preview_max_x' => 4096,
'preview_max_y' => 4096,
'preview_max_filesize_image' => 50,
'preview_max_memory' => 1024,
);
The output of your Apache/nginx/system log in /var/log/____:
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message
[Sun Sep 29 21:08:00.306974 2024] [lbmethod_heartbeat:notice] [pid 1142:tid 1142] AH02282: No slotmem from mod_heartmonitor
[Sun Sep 29 21:08:00.309034 2024] [systemd:notice] [pid 1142:tid 1142] SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0
[Sun Sep 29 21:08:00.316193 2024] [mpm_event:notice] [pid 1142:tid 1142] AH00489: Apache/2.4.62 (Fedora Linux) OpenSSL/3.2.2 configured -- resuming normal operations
[Sun Sep 29 21:08:00.316222 2024] [core:notice] [pid 1142:tid 1142] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
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.
Same error from updater.phar