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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): 21.0.9.1
Operating system and version (eg, Ubuntu 20.04): Debian 10 (buster) / Raspbian (32bit)
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.38-3
PHP version (eg, 7.4): PHP 8.0.16-1
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
-
Rename config.php to test1234
-
Wait until the background cron.php job runs once again or trigger it manually (it will crash):
root@germanicus:/var/www/nextcloud/config# sudo -u www-data php -f /var/www/nextcloud/cron.php --define apc.enable_cli=1
Exception: Not installed in /var/www/nextcloud/lib/base.php:276
Stack trace:
#0 /var/www/nextcloud/lib/base.php(643): OC::checkInstalled()
#1 /var/www/nextcloud/lib/base.php(1076): OC::init()
#2 /var/www/nextcloud/cron.php(43): require_once(’…’)
#3 {main} -
Browse to https://int.ern.al.ip from nextcloud
-
Error message appears: It looks like you are trying to reinstall Nextcloud. CAN_INSTALL file is missing to proceed
-
Rename test1234 to config.php once again
-
Error message persists
-
Reboot does not fix the issue
The output of your Nextcloud log in Admin > Logging:
Too much output to paste here, can check it later
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oceru6sviz2u',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '192.168.200.4',
2 => 'foo.ddns.net',
),
'datadirectory' => '/opt/nextcloud/DATA',
'tempdirectory' => '/opt/nextcloud/DATA/TEMP_UPLOAD',
'dbtype' => 'mysql',
'version' => '21.0.9.1',
'overwrite.cli.url' => 'https://foo.ddns.net',
'overwriteprotocol' => 'https',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxx',
'dbpassword' => 'xxx',
'installed' => 'true',
'maintenance' => false,
'ldapIgnoreNamingRules' => 'false',
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'theme' => '',
'loglevel' => 3,
'log_type' => 'file',
'logfile' => '/opt/nextcloud/DATA/nextcloud.log',
'default_phone_region' => 'DE',
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => '0',
'timeout' => '0.0',
'password' => 'xxx',
),
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'data-fingerprint' => 'xxx',
'defaultapp' => 'spreed,files',
'default_language' => 'de',
);
The output of your Apache/nginx/system log in /var/log/____:
No logs related to this issue
How can I rewind this?
I checked the config.php file - the installed = true parameter is still there
there is also no CAN_INSTALL file in my config/config.php
There is also no other config.php on my system available
When you asked me why I did this:
I did it, because I had errors in webui admin overview regarding missing “default_phone_region” and missing memory caching, although the config.php delivers these information.
It did also not accept the settings when I manually tried to configure these “missing” information over command line.
For example, this did not change anything on nextcloud’s behaviour:
root@germanicus:/var/www/nextcloud# sudo -u www-data php occ config:system:set default_phone_region --value=“DE”
System config value default_phone_region set to string DE
root@germanicus:/var/www/nextcloud#
I thought this step is helpful for the nextcloud to finally recognize the specific settings.
The manual launch of cron.php is still working without any issue and error and I thought it should fix the status back to “normal”
The permissions for www-data on config.php is also good (640):
root@germanicus:/var/www/nextcloud# ls -lah config/config.php
-rw-r----- 1 www-data www-data 1,6K Feb 24 16:28 config/config.php
root@germanicus:/var/www/nextcloud#
What else needs to be done to make the nextcloud understand that it is installed?
Many thanks for any kind of help!