Nextcloud fails to launch using PHP 7.3

ℹ️ Support
1

Nextcloud version 15.0.8
Operating system and version Ubuntu 18.04
Apache or nginx version Apache 2.4.29
PHP version 7.3

The issue you are facing:
Getting this error in PHP Log. I’ve tried updating to 7.2 and 7.3 and get this same error. I want to move to NC 16, so I’m breaking it with this until I find a solution. Any help is appreciated.

[Sat Jul 06 01:22:31.530928 2019] [php7:error] [pid 2350] [client 211.22.184.210:57762] PHP Fatal error:  Uncaught Doctrine\\DBAL\\DBALException: Failed to connect to the database: An exception occured in driver: could not find driver in /var/www/nextcloud/lib/private/DB/Connection.php:64\nStack trace:\n#0 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(429): OC\\DB\\Connection->connect()\n#1 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(389): Doctrine\\DBAL\\Connection->getDatabasePlatformVersion()\n#2 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(328): Doctrine\\DBAL\\Connection->detectDatabasePlatform()\n#3 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(623): Doctrine\\DBAL\\Connection->getDatabasePlatform()\n#4 /var/www/nextcloud/lib/private/DB/Connection.php(151): Doctrine\\DBAL\\Connection->setTransactionIsolation(2)\n#5 /var/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/DriverManager.php(172): OC\\DB\\Connection->__construct(Array, Object(Doctrine\\DBAL\\Driver\\PDOMySql\\Driver), Object(Doctrine\\DBAL\\Configura in /var/www/nextcloud/lib/private/DB/Connection.php on line 64
[Sat Jul 06 01:22:46.717420 2019] [mpm_prefork:notice] [pid 2311] AH00169: caught SIGTERM, shutting down

Is this the first time you’ve seen this error? (Y/N): N

Steps to replicate it:

  1. Run Nextcloud 15 using PHP 7.0
  2. Change PHP Version to higher than 7.0

The output of your Nextcloud log in Admin > Logging: Nextcloud won’t launch

The output of your config.php: Config file was unchanged - only PHP version changed.

The output of your Apache log: Pasted above

2

You php 7.3 install misses the required database driver. You need to install the php driver modules for your database.

3

Fixed all Apache modules and warnings but was still hit with the Internal Server error. Looked into the NC log and the issue was the php7.3-redis module was missing. It’s fixed now.

Thanks for your help!