Thank you very much for providing more details.
I admit that the current pre-requisites check is mostly based on shared hosting with the main requisites already in place. In fact, the situation can be very much different with dedicated servers and it makes sense to have a more complete list. I'll post a request for that on Github.

Zet,

My apologies. The documentation for installation does not indicate what packages are required. I installed a bunch of packages and it finally installed. What packages I installed or which one it was missing I don't know since there is no clear list of what it needs.

Here was the final command that allowed me to get past that three line Prerequisites list shown in my initial post.

apt-get install php7.0-cli php7.0-common php7.0-json php7.0-mcrypt php7.0-mysql php7.0-xml php7.0-curl php7.0-zip php7.0-gd

Please have in mind that this forum is meant for SHARING solutions. Just advising to install 'something undocumented' is of no help for anyone.

Figured it out, Undocumented php packages had to be installed.