I'm running a CentOS 7 + WebPanel 7 server with a single user package.
The server is currently configured with apache, php-fpm 7.2.15 and uses ssl.
After installing Magento 2.3 through softaculous I get "500 Internal server error" messages when trying to access the magento store or the admin area.
A phphinfo file created to check whether php is configured correctly will also fail.
Removing .htaccess in the folder solved the problem for the phpinfo file but magento index.php throws a "this page is not working error".
(PHPInfo shows the memory size at 756M)
I checked the apache logs but nothing shows up here.
I also tried the same using nginx instead of apache. Here I see the index.php but without the css applied, accessing admin or any other page gives a 404 error.
After spending a few days trying to figure this out, I hope someone can give me pointers in the right direction to get this sorted.