Kein Login prompt nach Systemupgrade

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Nextcloud version (eg, 12.0.2): 13.0.5
Operating system and version (eg, Ubuntu 17.04): Debian testing
Apache or nginx version (eg, Apache 2.4.25): nginx 1.13.12-1
PHP version (eg, 7.1): 7.1

The issue you are facing:
Hallo,
nach einem Systemupgade erhalte ich kein login-prompt mehr. Es erschein folgende Fehlermeldung:
"Internal Server Error

The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log."

Ebenfalls kann mit der Smartphone apps nicht mehr auf die cloud zugegriffen werden.

Ich habe aber keine neuen Apps installiert!

Wer kann mir weiterhelfen?
Danke.

Michibaby

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:

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 => '192.168.178.120',
    1 => 'michaelscloud.spdns.de',
  ),
  'datadirectory' => '/mnt/array1/All_Users_Share/cloud-data',
  'overwrite.cli.url' => 'https://192.168.178.120',
  'dbtype' => 'mysql',
  'version' => '13.0.5.2',
  'dbname' => 'nextclouddb',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'oc_admin3',
  'dbpassword' => ...,
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
);

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

2018/08/31 17:46:45 [warn] 953#953: server name "http://michaelscloud.spdns.de" has suspicious symbols in /etc/ngin
x/sites-enabled/default:3
2018/08/31 17:46:45 [warn] 953#953: server name "http://michaelscloud.spdns.de" has suspicious symbols in /etc/ngin
x/sites-enabled/default:10
2018/08/31 18:31:04 [warn] 5639#5639: server name "http://michaelscloud.spdns.de" has suspicious symbols in /etc/ng
inx/sites-enabled/default:3
2018/08/31 18:31:04 [warn] 5639#5639: server name "http://michaelscloud.spdns.de" has suspicious symbols in /etc/ng
inx/sites-enabled/default:10
2018/08/31 18:31:04 [warn] 5640#5640: server name "http://michaelscloud.spdns.de" has suspicious symbols in /etc/ng
inx/sites-enabled/default:3
2018/08/31 18:31:04 [warn] 5640#5640: server name "http://michaelscloud.spdns.de" has suspicious symbols in /etc/ng
inx/sites-enabled/default:10
2018/08/31 19:09:34 [crit] 5643#5643: *35 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_c
lient_hello:version too low) while SSL handshaking, client: 74.82.47.3, server: 0.0.0.0:443

Vom PC oder App logge ich mich augenblicklich nur über die lokale Adresse (siehe config file) ein.

Ich habe schon diverse Anregungen zu den Rechten der Dateien ausprobiert. Auch den Hinweis zur Deaktivierung der apps habe ich versucht durchzufüheren und erhalte diese Fehlermeldung:

root@HomeServer:/var/www/cloud# sudo -u www-data php occ app:disable external
An unhandled exception has been thrown:
Error: Call to undefined function OC\App\simplexml_load_file() in /var/www/cloud/lib/private/App/InfoParser.php:64
Stack trace:
#0 /var/www/cloud/lib/private/legacy/app.php(621): OC\App\InfoParser->parse('/var/www/cloud/...')
#1 /var/www/cloud/lib/private/AppFramework/App.php(62): OC_App::getAppInfo('files')
#2 /var/www/cloud/lib/private/legacy/app.php(220): OC\AppFramework\App::buildAppNamespace('files')
#3 /var/www/cloud/lib/private/legacy/app.php(119): OC_App::registerAutoloading('files', '/var/www/cloud/...')
#4 /var/www/cloud/lib/base.php(662): OC_App::loadApps(Array)
#5 /var/www/cloud/lib/base.php(1081): OC::init()
#6 /var/www/cloud/console.php(46): require_once('/var/www/cloud/...')
#7 /var/www/cloud/occ(11): require_once('/var/www/cloud/...')
#8 {main}root@HomeServer:/var/www/cloud#