Nextcloud version (eg, 18.0.2): 20.0.2.2
Operating system and version (eg, Ubuntu 20.04): Raspbian Buster
Apache or nginx version (eg, Apache 2.4.25): 2.4.38
PHP version (eg, 7.1): 7.3.19-1
The issue you are facing:
Trying to access Nextcloud via my browser, I see a white screen saying “Internal Server Error”. When trying to sync via Davx5, I see an Error 500.
Is this the first time you’ve seen this error? (Y/N): Yes. I installed Nextcloud 2 days ago. The error suddenly started happening last night, for no apparent reason.
The output of your Nextcloud log in Admin > Logging:
{"reqId":"3Mks0Tcbty9OWY1D9ivC","level":3,"time":"2020-12-01T08:41:12+00:00","remoteAddr":"192.168.1.10","user":"--","app":"remote","method":"GET","url":"/nextcloud/status.php","message":{"Exception":"Doctrine\\DBAL\\DBALException","Message":"Failed to connect to the database: An exception occurred in driver: could not find driver","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php","line":1449,"function":"connect","class":"OC\\DB\\Connection","type":"->","args":[]},{"file":"/var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php","line":892,"function":"getWrappedConnection","class":"Doctrine\\DBAL\\Connection","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/DB/Connection.php","line":202,"function":"executeQuery","class":"Doctrine\\DBAL\\Connection","type":"->","args":["SELECT * FROM `oc_appconfig`",[],[],null]},{"file":"/var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Query/QueryBuilder.php","line":206,"function":"executeQuery","class":"OC\\DB\\Connection","type":"->","args":["SELECT * FROM `oc_appconfig`",[],[]]},{"file":"/var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php","line":217,"function":"execute","class":"Doctrine\\DBAL\\Query\\QueryBuilder","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/AppConfig.php","line":345,"function":"execute","class":"OC\\DB\\QueryBuilder\\QueryBuilder","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/AppConfig.php","line":110,"function":"loadConfigValues","class":"OC\\AppConfig","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/AppConfig.php","line":301,"function":"getApps","class":"OC\\AppConfig","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/legacy/OC_App.php","line":949,"function":"getValues","class":"OC\\AppConfig","type":"->","args":[false,"installed_version"]},{"file":"/var/www/nextcloud/lib/private/Server.php","line":668,"function":"getAppVersions","class":"OC_App","type":"::","args":[]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":118,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->","args":["OC\\Memcache\\Factory"]},{"file":"/var/www/nextcloud/lib/private/ServerContainer.php","line":156,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["OC\\Memcache\\Factory",true]},{"file":"/var/www/nextcloud/lib/private/Server.php","line":1677,"function":"query","class":"OC\\ServerContainer","type":"->","args":["OC\\Memcache\\Factory"]},{"file":"/var/www/nextcloud/lib/private/Server.php","line":1017,"function":"getMemCacheFactory","class":"OC\\Server","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":118,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->","args":["OCP\\Lock\\ILockingProvider"]},{"file":"/var/www/nextcloud/lib/private/ServerContainer.php","line":156,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["OCP\\Lock\\ILockingProvider",true]},{"file":"/var/www/nextcloud/lib/private/Server.php","line":1977,"function":"query","class":"OC\\ServerContainer","type":"->","args":["OCP\\Lock\\ILockingProvider"]},{"file":"/var/www/nextcloud/lib/private/Files/View.php","line":118,"function":"getLockingProvider","class":"OC\\Server","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/Server.php","line":395,"function":"__construct","class":"OC\\Files\\View","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":118,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->","args":["OC\\Files\\Node\\HookConnector"]},{"file":"/var/www/nextcloud/lib/private/ServerContainer.php","line":156,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["OC\\Files\\Node\\HookConnector",true]},{"file":"/var/www/nextcloud/lib/private/Server.php","line":1324,"function":"query","class":"OC\\ServerContainer","type":"->","args":["OC\\Files\\Node\\HookConnector"]},{"file":"/var/www/nextcloud/lib/base.php","line":595,"function":"boot","class":"OC\\Server","type":"->","args":[]},{"file":"/var/www/nextcloud/lib/base.php","line":1091,"function":"init","class":"OC","type":"::","args":[]},{"file":"/var/www/nextcloud/status.php","line":37,"args":["/var/www/nextcloud/lib/base.php"],"function":"require_once"}],"File":"/var/www/nextcloud/lib/private/DB/Connection.php","Line":72,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Linux) mirall/2.3.3 (Nextcloud)","version":"20.0.2.2"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxx',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => '192.168.1.14',
),
'datadirectory' => '/var/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '20.0.2.2',
'overwrite.cli.url' => 'http://192.168.1.14/nextcloud',
'dbname' => 'xxx',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxx',
'dbpassword' => 'xxx',
'installed' => true,
'app_install_overwrite' =>
array (
0 => 'joplin',
),
);
The output of your Apache/nginx/system log in /var/log/____: Please see https://pastebin.com/DV6JnN2x
Extra info:
- Apache seems to be working fine;
- I tried
sudo -u www-data php -iand the PhP info seems all good (at least it corresponds to the php version I get when doing<?php phpinfo(); ?>)
All help would be much appreciated!! 
