Nextcloud connection to server lost issues on my Ubuntu 18.04 server

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Nextcloud version (eg, 18.0.2): 19.0.0.12
Operating system and version (eg, Ubuntu 20.04): Ubuntu 18.04 LTS
Apache or nginx version (eg, Apache 2.4.25): 2.4.29
PHP version (eg, 7.1): 7.2

The issue you are facing:

Hello ! I’m having issues on my Nextcloud : Users and admin can’t access or share files, every page put connection to server lost, nextcloud tell me that webdav isn’t working :confused:.
My nextcloud don’t have SSL yet so tell me if this is link.

I’m not that great to find errors myself and i don’t understant logs so if i have to show u files i can.

Is this the first time you’ve seen this error? (Y/N): This is the first time even if installed nextcloud on test VM before and i hadn’t this issue.

The output of your Nextcloud log in Admin > Logging:

{"reqId":"w80cHxZtopMul6vcrugs","level":3,"time":"2020-07-30T14:05:21+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/csrftoken","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"w80cHxZtopMul6vcrugs","level":3,"time":"2020-07-30T14:05:21+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/csrftoken","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"3MSEfcRErPLMfnTdpkeO","level":3,"time":"2020-07-30T14:09:53+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"3MSEfcRErPLMfnTdpkeO","level":3,"time":"2020-07-30T14:09:53+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"3MSEfcRErPLMfnTdpkeO","level":3,"time":"2020-07-30T14:09:56+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"3MSEfcRErPLMfnTdpkeO","level":3,"time":"2020-07-30T14:09:56+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"LxjrjF83baZ33IqlUvz9","level":3,"time":"2020-07-30T14:11:10+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/text/workspace?path=%2F","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"LxjrjF83baZ33IqlUvz9","level":3,"time":"2020-07-30T14:11:10+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/text/workspace?path=%2F","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"LxjrjF83baZ33IqlUvz9","level":3,"time":"2020-07-30T14:11:11+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/text/workspace?path=%2F","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"LxjrjF83baZ33IqlUvz9","level":3,"time":"2020-07-30T14:11:11+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/ocs/v2.php/apps/text/workspace?path=%2F","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"wzcWSD0ZSfBkGZbq0KzA","level":3,"time":"2020-07-30T14:11:12+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"wzcWSD0ZSfBkGZbq0KzA","level":3,"time":"2020-07-30T14:11:12+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"wzcWSD0ZSfBkGZbq0KzA","level":3,"time":"2020-07-30T14:11:12+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"wzcWSD0ZSfBkGZbq0KzA","level":3,"time":"2020-07-30T14:11:13+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"G1m1kwK57qM0E8zWsh7r","level":3,"time":"2020-07-30T14:11:14+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"G1m1kwK57qM0E8zWsh7r","level":3,"time":"2020-07-30T14:11:14+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"G1m1kwK57qM0E8zWsh7r","level":3,"time":"2020-07-30T14:11:15+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"G1m1kwK57qM0E8zWsh7r","level":3,"time":"2020-07-30T14:11:15+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"psJW6TZU0vASOk31m6nt","level":3,"time":"2020-07-30T14:11:17+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"psJW6TZU0vASOk31m6nt","level":3,"time":"2020-07-30T14:11:17+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"psJW6TZU0vASOk31m6nt","level":3,"time":"2020-07-30T14:11:18+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"psJW6TZU0vASOk31m6nt","level":3,"time":"2020-07-30T14:11:18+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/settings/user","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"ruIwfnhvi9lOVv9jiEHT","level":3,"time":"2020-07-30T14:11:19+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"ruIwfnhvi9lOVv9jiEHT","level":3,"time":"2020-07-30T14:11:19+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"ruIwfnhvi9lOVv9jiEHT","level":3,"time":"2020-07-30T14:11:21+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"ruIwfnhvi9lOVv9jiEHT","level":3,"time":"2020-07-30T14:11:21+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"xM3oWB851oHHkSofRuxU","level":3,"time":"2020-07-30T14:11:21+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/apps/files/","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"xM3oWB851oHHkSofRuxU","level":3,"time":"2020-07-30T14:11:22+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/apps/files/","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"xM3oWB851oHHkSofRuxU","level":3,"time":"2020-07-30T14:11:22+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/apps/files/","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"xM3oWB851oHHkSofRuxU","level":3,"time":"2020-07-30T14:11:22+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/apps/files/","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"1X8MVyVu6wsc8QQ9INs6","level":3,"time":"2020-07-30T14:11:23+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"1X8MVyVu6wsc8QQ9INs6","level":3,"time":"2020-07-30T14:11:24+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"1X8MVyVu6wsc8QQ9INs6","level":3,"time":"2020-07-30T14:11:25+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.publicKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}
{"reqId":"1X8MVyVu6wsc8QQ9INs6","level":3,"time":"2020-07-30T14:11:25+00:00","remoteAddr":"192.168.64.254","user":"admin","app":"PHP","method":"GET","url":"/favicon.ico","message":"file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/master_6ba28b39.privateKey): failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#273","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36","version":"19.0.1.1"}

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' =>
  array (
    0 => '',
  ),
  'overwrite.cli.url' => '',
  'htaccess.RewriteBase' => '/',
  'datadirectory' => '/var/www/nextcloud/data',
  'logfile' => '/var/log/nextcloud.log',
  'dbtype' => 'mysql',
  'proxy' => '',
  'version' => '19.0.1.1',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => '',
  'dbpassword' => '!',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'ssl',
  'mail_sendmailmode' => 'smtp',
  'theme' => 'mytheme',
  'log_type' => 'file',
  'logfile' => '',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'localhost',
    'port' => ,
  ),
  'updater.secret' => 
  'maintenance' => false,
  'loglevel' => 2,
 'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'localhost',
    'port' => ,
  ),
  'app_install_overwrite' =>
  array (
    0 => 'registration',
  ),
);


The output of your Apache/nginx/system log in /var/log/____:


192.168.64.254 - - [30/Jul/2020:07:40:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:40:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:41:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:41:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:42:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:42:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:43:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:43:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:44:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:44:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:45:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:45:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:46:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:46:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:47:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:47:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:48:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:48:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:49:27 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:49:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:50:28 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:50:57 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:51:28 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:51:29 +0000] "GET /csrftoken HTTP/1.1" 200 837 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105$
192.168.64.254 - - [30/Jul/2020:07:51:58 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:52:28 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:52:58 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 304 246 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:53:09 +0000] "GET /apps/files/ HTTP/1.1" 200 9574 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.$
192.168.64.254 - - [30/Jul/2020:07:53:11 +0000] "GET /apps/files/ HTTP/1.1" 200 9571 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.$
192.168.64.254 - - [30/Jul/2020:07:53:12 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 846 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36$
192.168.64.254 - - [30/Jul/2020:07:53:13 +0000] "GET /apps/encryption/ajax/getStatus HTTP/1.1" 200 834 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)$
192.168.64.254 - - [30/Jul/2020:07:53:13 +0000] "GET /themes/mytheme/core/img/favicon.ico HTTP/1.1" 200 6202 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like $
192.168.64.254 - - [30/Jul/2020:07:53:13 +0000] "GET /apps/systemtags/lastused HTTP/1.1" 200 734 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrom$

Do these files and path exist?

file_put_contents(/var/log/files_encryption/OC_DEFAULT_MODULE/pubShare_6ba28b39.publicKey): failed to open stream

What are the permission.

You are using encryption module, right?