I have trouble with my Php version. Owncloud tells me that I’m running an old version but I’m not.
When I check with php -v I get this : PHP 7.3.9-1+0~20190902.44+debian9~1.gbpf8534c (cli) (built: Sep 2 2019 13:31:30) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.3.9, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.3.9-1+0~20190902.44+debian9~1.gbpf8534c, Copyright (c) 1999-2018, by Zend Technologies
but when I connect to my url Owncloud gives me this message : This version of ownCloud requires at least PHP 7.0.7 You are currently running PHP 5.6.40-12+0~20190902.20+debian9~1.gbpc72558. Please update your PHP version.
Have a look in /etc/apache2/mods-enabled/. Make sure you enable the correct PHP version in apache, available versions should be visible in /etc/apache2/mods-available/. To enable the corrrect version use the a2enmod command.
Afterwards restart your apache with systemctl restart apache2.
Please be aware that ownCloud only supports PHP 7.3 with the upcoming version 10.3.