Official Ubuntu install instructions

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.

https://hostpresto.com/community/tutorials/install-and-configure-grav-cms-on-ubuntu-16-04/

https://www.rosehosting.com/blog/install-grav-on-an-ubuntu-vps/

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!