1. install openssh on the computer you want to remotly log into sudo apt-get install openssh
2. port forward that computer at port 22(default for ssh) 3.logon from another computer with this command replacing the example ip adress with your routers externel ip
e.g ssh root@77.23.11.22now you can remotly connnect to that computer through the internet just make sure you have a strong password!
i think there is a way if you search it to have remote desktops but i have not tried it
