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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, 12.0.2): 15.1 (?)
Operating system and version (eg, Ubuntu 17.04): Raspbian/ Linux 9
Apache or nginx version (eg, Apache 2.4.25): unknown
PHP version (eg, 7.1): unknown
The issue you are facing:
Cannot open web interface of nextcloud. Nextcloud version unknown as nextcloud plus updates itself automatically.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Always occurs
The output of your Nextcloud log in Admin > Logging:
No clue how to access this
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'passwordsalt' => 'deleted',
'secret' => 'deleted',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '192.168.1.101',
2 => 'deleted.de',
3 => '192.168.1.101',
5 => 'nextcloudpi.local',
7 => 'nextcloudpi',
8 => 'nextcloudpi.lan',
4 => 'deleted',
11 => 'deleted',
),
'datadirectory' => '/media/Touro1TB/NCP',
'overwrite.cli.url' => 'deleted/',
'dbtype' => 'mysql',
'version' => '15.0.5.3',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ncadmin',
'dbpassword' => 'deleted',
The output of your Apache/nginx/system log in /var/log/____:
root@nextcloudplus:/var/log/apache2# cd /var/log/apache2
root@nextcloudplus:/var/log/apache2# ls
access.log error.log.9.gz nc-error.log other_vhosts_access.log.1
access.log.1 nc-access.log nc-error.log.1 other_vhosts_access.log.10.gz
error.log nc-access.log.1 nc-error.log.10.gz other_vhosts_access.log.11.gz
error.log.1 nc-access.log.10.gz nc-error.log.11.gz other_vhosts_access.log.12.gz
error.log.10.gz nc-access.log.11.gz nc-error.log.12.gz other_vhosts_access.log.13.gz
error.log.11.gz nc-access.log.12.gz nc-error.log.13.gz other_vhosts_access.log.14.gz
error.log.12.gz nc-access.log.13.gz nc-error.log.14.gz other_vhosts_access.log.2.gz
error.log.13.gz nc-access.log.14.gz nc-error.log.2.gz other_vhosts_access.log.3.gz
error.log.14.gz nc-access.log.2.gz nc-error.log.3.gz other_vhosts_access.log.4.gz
error.log.2.gz nc-access.log.3.gz nc-error.log.4.gz other_vhosts_access.log.5.gz
error.log.3.gz nc-access.log.4.gz nc-error.log.5.gz other_vhosts_access.log.6.gz
error.log.4.gz nc-access.log.5.gz nc-error.log.6.gz other_vhosts_access.log.7.gz
error.log.5.gz nc-access.log.6.gz nc-error.log.7.gz other_vhosts_access.log.8.gz
error.log.6.gz nc-access.log.7.gz nc-error.log.8.gz other_vhosts_access.log.9.gz
error.log.7.gz nc-access.log.8.gz nc-error.log.9.gz
error.log.8.gz nc-access.log.9.gz other_vhosts_access.log
The output of ncp-report: