You are currently running PHP 7.0.33-0+deb9u3. Upgrade your PHP version to take advantage of performance and security updates provided by the PHP Group as soon as your distribution supports it.
Please double check the installation guides ↗, and check for any errors or warnings in the log.
I updated php to 7.3
php -v
`PHP 7.3.3-1+0~20190307202245.32+stretch~1.gbp32ebb2 (cli) (built: Mar 7 2019 20:22:46) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.3, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.3-1+0~20190307202245.32+stretch~1.gbp32ebb2, Copyright (c) 1999-2018, by Zend Technologies`
systemctl restart apache2
And still shows me that I have php 7.0.33 …
Where could the problem be?
Internal Server Error
The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.
I’ll just add that in my case (Nextcloud 15 on Synology NAS) I had to go to Synology -> Web Station -> General Settings and selecting Apache 2.4, php 7.2 and Apply. Restarted.