Fatal error on new 14.0.0 install

I’m installing Nextcloud 14.0.0 on Ubuntu server 18.04 LTS and LAMP.

When I try to access my Nextcloud web page I get an internal server error and the Apache log shows this:

Fatal error: Uncaught Error: Call to a member function getLogger() on null in /nextcloud/index.php:72 Stack trace:

Any help would be appreciated.