Are there official or recommended instructions for installing grav
The official site makes it sounds like all you need to do is unzip into a folder and go, but quickly I found there are numerous php extensions needed.
I searched and found some other instructions like those below, but they are each different.
Appreciate any help.
The DigitalOcean VPS instructions https://learn.getgrav.org/webservers-hosting/vps/digitalocean target Ubuntu.
Also, we have a blog post on the easiest possible Ubuntu setup using ServerPilot: https://getgrav.org/blog/fast-free-grav-development
Hope this helps!