Raspberry Pi - absolutely no chance to run cron.php

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Nextcloud version (eg, 12.0.2): 14
Operating system and version (eg, Ubuntu 17.04): Raspbian
Apache or nginx version (eg, Apache 2.4.25): Apache2
PHP version (eg, 7.1): PHP 7.0

The issue you are facing:

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

Steps to replicate it:

  1. every way how to access cron.php by www-data

The output of your Nextcloud log in Admin > Logging:

PASTE HERE

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

PASTE HERE

The output of your Apache/nginx/system log in /var/log/____:

PASTE HERE

I cannot run cron.php for nothing. I did everything I could find out about this problem.
My file is in /var/www/html/nextcloud/cron.php
I have created a cronjob correctly.
When I put in “sudo crontab -u www-data -e” it opens the file with cronjobs for user www-data. There the last line is:
0,15,30,45 * * * * wget https://mattzel820.ddns.net/nextcloud/cron.php
Before it was the local path, both ways dont work.
So I checked if I can run the file normally als www-data. I cannot
I changed permissions for the file by chmod and the folder ownership both to www-data. I tried open the file by www-data over local path, my IP/nextcloud/cron.php and over my domain/nextcloud/cron.php
Every time. Every time! I see

Could not open input file: /var/www/html/nextcloud/cron.php
or
Cannot write to ‘cron.php’ (Permission denied)
What else can I do? I think I tried everything I can, this problem is killing me, because I just created the cronjob and now even AJAX doesnt work, when I try to revert.
I mean if www-data has all permissions to even the folders above, how cannot it run the file?
I checked if www-data is the correct owner of the folder where the file is and it is indeed, so there isnt the problem. I can open the file normally, but I cannot open it as www-data. I just cannot

2

How come you configured
wget https://.... ?

The documentation (https://docs.nextcloud.com/server/14/admin_manual/configuration_server/background_jobs_configuration.html?highlight=cron#cron) reads:

# crontab -u www-data -e
*/15  *  *  *  * php -f /var/www/nextcloud/cron.php

So your cron job should look like:
*/15 * * * * php -f /var/www/html/nextcloud/cron.php

What happens when you run:
sudo -u www-data php -f /var/www/html/nextcloud/cron.php
manually? Any error messages?

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