Please help us by providing the following info. Before posting please also check the pinned "Known issues" threads and make sure that you're running the latest available version for your oC release: https://owncloud.org/changelog/
Steps to reproduce
1. Just upgrade running oc 9.1 from ubuntu 14.04 LTS to 16.04 LTS
2.
3.
Expected behaviour
oc9.1 running on a ubuntu 16.04 LTS server
Actual behaviour
OC 9.1 doesn't start.
After try some occ commands, answer is always an error:
#0 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(429): OC\DB\Connection->connect()
#1 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(389): Doctrine\DBAL\Connection->getDatabasePlatformVersion()
#2 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(328): Doctrine\DBAL\Connection->detectDatabasePlatform()
#3 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(621): Doctrine\DBAL\Connection->getDatabasePlatform()
#4 /var/www/owncloud/lib/private/DB/Connection.php(141): Doctrine\DBAL\Connection->setTransactionIsolation(2)
#5 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(172): OC\DB\Connection->__construct(Array, Object(Doctrine\DBAL\Driver\PDOMySql\Driver), Object(Doctrine\DBAL\Configuration), Object(Doctrine\Common\EventManager))
#6 /var/www/owncloud/lib/private/DB/ConnectionFactory.php(120): Doctrine\DBAL\DriverManager::getConnection(Array, Object(Doctrine\DBAL\Configuration), Object(Doctrine\Common\EventManager))
#7 /var/www/owncloud/lib/private/Server.php(410): OC\DB\ConnectionFactory->getConnection('mysql', Array)
#8 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#9 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('DatabaseConnect...')
#10 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('DatabaseConnect...')
#11 /var/www/owncloud/lib/private/Server.php(969): OC\ServerContainer->query('DatabaseConnect...')
#12 /var/www/owncloud/lib/private/Server.php(215): OC\Server->getDatabaseConnection()
#13 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#14 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('OC\\Authenticati...')
#15 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
#16 /var/www/owncloud/lib/private/Server.php(219): OC\ServerContainer->query('OC\\Authenticati...')
#17 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#18 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('OC\\Authenticati...')
#19 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
#20 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(150): OC\ServerContainer->query('OC\\Authenticati...')
#21 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(109): OC\AppFramework\Utility\SimpleContainer->OC\AppFramework\Utility\{closure}(Object(OC\Server))
#22 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('OC\\Authenticati...')
#23 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('OC\\Authenticati...')
#24 /var/www/owncloud/lib/private/Server.php(234): OC\ServerContainer->query('OC\\Authenticati...')
#25 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#26 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('UserSession')
#27 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('UserSession')
#28 /var/www/owncloud/lib/private/Server.php(853): OC\ServerContainer->query('UserSession')
#29 /var/www/owncloud/lib/private/Server.php(651): OC\Server->getSession()
#30 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#31 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('CsrfTokenManage...')
#32 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('CsrfTokenManage...')
#33 /var/www/owncloud/lib/private/Server.php(1309): OC\ServerContainer->query('CsrfTokenManage...')
#34 /var/www/owncloud/lib/private/Server.php(556): OC\Server->getCsrfTokenManager()
#35 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#36 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('Request')
#37 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('Request')
#38 /var/www/owncloud/lib/private/Server.php(720): OC\ServerContainer->query('Request')
#39 /var/www/owncloud/lib/private/Server.php(301): OC\Server->getRequest()
#40 /var/www/owncloud/3rdparty/pimple/pimple/src/Pimple/Container.php(113): OC\Server->OC\{closure}(Object(OC\Server))
#41 /var/www/owncloud/lib/private/AppFramework/Utility/SimpleContainer.php(102): Pimple\Container->offsetGet('L10NFactory')
#42 /var/www/owncloud/lib/private/ServerContainer.php(87): OC\AppFramework\Utility\SimpleContainer->query('L10NFactory')
#43 /var/www/owncloud/lib/private/Server.php(905): OC\ServerContainer->query('L10NFactory')
#44 /var/www/owncloud/lib/private/Server.php(916): OC\Server->getL10NFactory()
#45 /var/www/owncloud/lib/base.php(228): OC\Server->getL10N('lib')
#46 /var/www/owncloud/lib/base.php(578): OC::checkConfig()
#47 /var/www/owncloud/lib/base.php(967): OC::init()
#48 /var/www/owncloud/console.php(50): require_once('/var/www/ownclo...')
#49 /var/www/owncloud/occ(11): require_once('/var/www/ownclo...')Server configuration
Operating system: ubuntu 16.04 LTS
Web server:apache 2.4
Database: mysql
PHP version: 7.0
ownCloud version (see ownCloud admin page):9.1
Updated from an older ownCloud or fresh install:no changes on oc version
ownCloud log (data/owncloud.log, see https://central.owncloud.org/t/how-to-find-webserver-or-oc-logfile-enable-php-logfile/808): owncloud log is empty, no a single line (var/log/owncloud.log)
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): ldap sig in, nothing else.
Integrity status for oC9+ can't run it.
Login as admin user into your ownCloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.