New installation of V8.0.4 fails

Attached is a screenshot of PHP modules loaded on active Apache server.

You are correct, I am using postgresql.
Adding calendar was easy, mcrypt not so. My distro (SUSE) has no official mcrypt extension as the module is deprecated in favour of OpenSSL. I managed to find a community version but have had to downgrade PHP from 7.2.x to 7.1.x in order to resolve the conflicts. I have got ProjeQtor installed and working now but I would request that you sort out the dependency on mcrypt.

I do not know how I can keep my PHP version current if you are using a deprecated module. Do you have any plans to remove this as it's already difficult to support and can only get worse?

However, thanks very much for your patience in helping me find the source of my issue.

Thanks for that. I have re-upgraded to PHP 7.2 and without mcrypt it seems to work. Whether it's need for the first install I don't know. I have also found out that you can use PECL (PHP Extension Community Library) to provide the mcrypt functionality if required because the module is not included in PHP 7.2 at all.