Just like the manual a2enmod the following resolves the situation as well as now the old mod-php7.2 is "out-of-the-way".
$ apt install --reinstall libapache2-mod-php7.3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850933 Title: after upgrade 19.04 to 19.10, apache serves php code To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1850933/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs