I am running 7.3.14 at the moment and on my SiteGound server it's 7.3.16 so I think that if I upgrade I might get rid of my bug manifestation on my Turnkey Linux VM! :-)
I have a working site at SiteGround, it runs on WP 5.4.2. When I run it locally on my turnkey VM with 5.4 there is only a white page both in root and wp-admin, and with debug true I see the create_function warnings.
we have a few sites running on a wordpress turnkey. One of the sites is a multi-site from IIS I brought over. i have the apache server set for address of efg.com and servername of efg.com pointing to the directory it should. i have an ServerAlias of www.efg.com in the directive file. The problem is if i just go to efg.com it goes to a different server listed in the virtual hosts list, or will go to the main site of the multisite which isnt even created in the virtual host.