Installing erpnext on ubuntu server

i have bought a new dell t5500 server and i have installed ubuntu 16.04 server on it but i wants to install many erpnext versions on it such 8 and 7.2 and i wants to b able to connect remotly to my server me and another one of my team so one of us will be able to work on 7.2 and the other one will b able to work on 8 at the same time , so how can i do that ?

To begin with: