Cannot run occ commands

Nextcloud version: 16.0.3.0
Operating system and version: Ubuntu 18.04.3 LTS
Apache version: Apache/2.4.29 (Ubuntu)
PHP version: 7.2.20

The issue you are facing:

After migrating my Nextcloud to another virtual Server I had some problems with 4-byte support of my imported MYSQL databases. I was able to solve those problems but now, for some reason, I cannot run any occ command. I always get this output:

marc@XXXX:/var/www/nextcloud# sudo -u www-data php occ maintenance:mode --on
An unhandled exception has been thrown:
Error: Class 'PDO' not found in /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php:181
Stack trace:
#0 /var/www/nextcloud/lib/private/DB/ConnectionFactory.php(156): Doctrine\DBAL\DriverManager::getConnection(Array, Object(Doctrine\DBAL\Configuration), Object(Doctrine\Common\EventManager))
#1 /var/www/nextcloud/lib/private/Server.php(641): OC\DB\ConnectionFactory->getConnection('mysql', Array)
#2 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#3 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OCP\\IDBConnecti...')
#4 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OCP\\IDBConnecti...')
#5 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#6 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('DatabaseConnect...')
#7 /var/www/nextcloud/lib/private/Server.php(1560): OC\ServerContainer->query('DatabaseConnect...')
#8 /var/www/nextcloud/lib/private/Server.php(456): OC\Server->getDatabaseConnection()
#9 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#10 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OC\\AppConfig')
#11 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\AppConfig')
#12 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#13 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('AppConfig')
#14 /var/www/nextcloud/lib/private/Server.php(1489): OC\ServerContainer->query('AppConfig')
#15 /var/www/nextcloud/lib/private/legacy/app.php(881): OC\Server->getAppConfig()
#16 /var/www/nextcloud/lib/private/Server.php(501): OC_App::getAppVersions()
#17 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#18 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OC\\Memcache\\Fac...')
#19 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OC\\Memcache\\Fac...')
#20 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#21 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('MemCacheFactory')
#22 /var/www/nextcloud/lib/private/Server.php(1541): OC\ServerContainer->query('MemCacheFactory')
#23 /var/www/nextcloud/lib/base.php(885): OC\Server->getMemCacheFactory()
#24 /var/www/nextcloud/lib/base.php(627): OC::registerAutoloaderCache()
#25 /var/www/nextcloud/lib/base.php(1056): OC::init()
#26 /var/www/nextcloud/console.php(46): require_once('/var/www/nextcl...')
#27 /var/www/nextcloud/occ(11): require_once('/var/www/nextcl...')

The output of your Nextcloud log in Admin > Logging:

[PHP] Error: fread(): Length parameter must be greater than 0 at /var/www/nextcloud/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php#91

GET /remote.php/dav/files/marc/Bilder/SofortUpload/IMG_20180208_154331.jpg
from 84.157.236.135 by marc at 2019-08-19T11:19:36+00:00

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

<?php
$CONFIG = array (
  'instanceid' => 'XXXXXXXXXX',
  'passwordsalt' => 'XXXXXXXXXXXXXXXXXXXXXX',
  'secret' => 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
  'trusted_domains' => 
  array (
    0 => 'nextcloud.XXXXXXXXXXXX',
  ),
  'datadirectory' => '/var/www/nextcloud-data',
  'overwrite.cli.url' => 'https://nextcloud.XXXXXXXXXXXXXXXX/',
  'htaccess.RewriteBase' => '/',
  'dbtype' => 'mysql',
  'version' => '16.0.3.0',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'XXXXXXXXXXXXXXXX',
  'dbpassword' => 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
  'logtimezone' => 'UTC',
  'installed' => true,
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'localhost',
    'port' => 6379,
  ),
  'mail_from_address' => 'nextcloud.XXXXXXXXXXX',
  'mail_smtpmode' => 'smtp',
  'mail_domain' => 'XXXXXXXXXX',
  'maintenance' => false,
  'loglevel' => 2,
  'auth.bruteforce.protection.enabled' => true,
  'default_language' => 'de',
  'theme' => '',
  'updater.release.channel' => 'stable',
  'mail_smtpauthtype' => 'LOGIN',
  'logfile' => '/var/log/nextcloud.log',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpauth' => 1,
  'mail_smtphost' => 'XXXXXXXXXXXXXXX',
  'mail_smtpport' => '465',
  'mail_smtpname' => 'XXXXXXXXXXXXXXX',
  'mail_smtppassword' => 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
  'mail_smtpsecure' => 'ssl',
  'twofactor_enforced' => 'true',
  'twofactor_enforced_groups' => 
  array (
    0 => 'admin',
  ),
  'twofactor_enforced_excluded_groups' => 
  array (
    0 => 'XXX',
  ),
  'mysql.utf8mb4' => true,
  'updater.secret' => 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
  'app_install_overwrite' => 
  array (
    0 => 'files_downloadactivity',
    1 => 'admin_notifications',
    2 => 'end_to_end_encryption',
  ),
);

Edit:

The Cron-Job is also not working. If I run it manually I get an almost similar output as with the occ commands:

root@XXXXX:~# sudo -u www-data php -f /var/www/nextcloud/cron.php
PHP Fatal error:  Uncaught Error: Class 'PDO' not found in /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php:181
Stack trace:
#0 /var/www/nextcloud/lib/private/DB/ConnectionFactory.php(156): Doctrine\DBAL\DriverManager::getConnection(Array, Object(Doctrine\DBAL\Configuration), Object(Doctrine\Common\EventManager))
#1 /var/www/nextcloud/lib/private/Server.php(641): OC\DB\ConnectionFactory->getConnection('mysql', Array)
#2 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\Server->OC\{closure}(Object(OC\Server))
#3 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pimple\Container->offsetGet('OCP\\IDBConnecti...')
#4 /var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php(165): OC\ServerContainer->query('OCP\\IDBConnecti...')
#5 /var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php(114): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#6 /var/www/nextcloud/lib/private/ServerContainer.php(125): Pi in /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php on line 181

Okay, I solved the problem by reinstalling php7.2. :sweat_smile: