Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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): 25.0.13
Operating system and version (eg, Ubuntu 20.04): Debian 11
Apache or nginx version (eg, Apache 2.4.25): 2.4.56
PHP version (eg, 7.4): 8.0
The issue you are facing:
After upgrading to PHP8.0 I get “Internal Server Error”
Is this the first time you’ve seen this error? (Y/N): Y
The output of your Nextcloud log in Admin > Logging:
cannot access GUI
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'XXXXX',
'passwordsalt' => 'XXXXX',
'secret' => 'XXXXX',
'trusted_domains' =>
array (
0 => 'XXXXX.cloud',
),
'datadirectory' => '/var/www/nextcloud_data',
'overwrite.cli.url' => 'https://XXXXX.cloud',
'dbtype' => 'mysql',
'version' => '25.0.13.2',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => 'XXXXX',
'installed' => true,
'maintenance' => false,
'default_language' => 'de',
'theme' => '',
'loglevel' => 1,
'app_install_overwrite' =>
array (
0 => 'calendar',
1 => 'onlyoffice',
2 => 'spreed',
3 => 'integration_moodle',
),
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'cloud',
'mail_domain' => 'XXXXX',
'mail_smtpport' => '587',
'preview_max_x' => 2000,
'preview_max_y' => 2000,
'mysql.utf8mb4' => true,
'default_phone_region' => 'AT',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '127.0.0.1',
'port' => 6379,
'timeout' => 3,
),
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'mail_smtphost' => '192.168.222.3',
);
The output of your Apache/nginx/system log in /var/log/____:
error.log
[Thu Mar 28 19:21:19.817091 2024] [mpm_prefork:notice] [pid 3002] AH00170: caught SIGWINCH, shutting down gracefully
[Thu Mar 28 19:21:19.928500 2024] [ssl:warn] [pid 7718] AH01909: SRV-CLOUD1.XXXXX:443:0 server certificate does NOT include an ID which match>
[Thu Mar 28 19:21:19.997189 2024] [ssl:warn] [pid 7719] AH01909: SRV-CLOUD1.XXXXX:443:0 server certificate does NOT include an ID which match>
[Thu Mar 28 19:21:20.007893 2024] [mpm_prefork:notice] [pid 7719] AH00163: Apache/2.4.56 (Debian) OpenSSL/1.1.1w configured -- resuming normal operations
[Thu Mar 28 19:21:20.008003 2024] [core:notice] [pid 7719] AH00094: Command line: '/usr/sbin/apache2'
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.
no entries since PHP Update
Thanks in advance
Gerald