On discord chat (https://discord.gg/26wMygt), where users are helping each other, @marty#4491 contributed this guide on how to install GreenGekko on ubuntu linux (using Google Cloud or Azure services)
GreenGekko on GitHub (https://github.com/mark-sch/GreenGekko) Install PostgreSQL (https://computingforgeeks.com/install-postgresql-12-on-ubuntu/)