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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): 24.0.5.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.1
Apache or nginx version (eg, Apache 2.4.52): 2.4.52
PHP version (eg, 7.4): 8.1.2
The issue you are facing:
Internal Server Error
Remote Address: 10.0.3.1
- I am trying to learn NC
I was following this link
And somehow I am not able to log in to my NC
NC is on an lxc ubuntu 22.04.1 container
Its address is 10.0.3.38
Using firfox - 10.0.3.38 returns an Internal Server Error and it mentions 10.0.3.1
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:
I have no access to my Nextcloud.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oca2lrs6ec0s',
'passwordsalt' => 'EuGnI91xx881pDoSIoCUYxv0R6soMQ',
'secret' => 'F4NoGwVuQOG6j2bu2eZJykdNKszYo6oIPalMb19TGRVduysH',
'trusted_domains' =>
array (
0 => '10.0.3.38',
),
'datadirectory' => '/var/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '24.0.5.1',
'overwrite.cli.url' => 'http://10.0.3.38',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:80',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nc2',
'dbpassword' => 'nc2',
'installed' => true,
'memcache.distributed' => '\OC\Memcache\Redis',
'redis' => [
'host' => '10.0.3.38',
'port' => 6379,
],
);
The output of your Apache/nginx/system log in /var/log/____:
there are three .log files here - access/error/other_vhosts_access.log - I am not sure which one you’re after - I provided a pastebin link for the other_vhosts_access.log as it seemed most promising
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.
There was no nextcloud.log file in the /var/www/nextcloud/