How to connect to Ubuntu server with SSH
SSH, or Secure Shell, is a protocol used to securely log onto remote systems. It is the most common way to access remote Linux and Unix-like servers.
Install SSH server on your Ubuntu server
First must install SSH server to Ubuntu
sudo apt-get update
sudo apt-get install openssh-server
And you can start it with
sudo systemctl start ssh
In order to configure SSH run
nano /etc/ssh/sshd_config
For changes in configuration to ake effect, must restar SSH server
service ssh restart
Connect remotely with SSH
To access remotely the Ubuntu server from another terminal type
ssh username@remote_host_ip
If you use the same user in both of the computers can use just
ssh remote_host_ip
And finally, anytime can disconnect from the remote server with the command
exit
More info
https://www.digitalocean.com/community/tutorials/how-to-use-ssh-to-connect-to-a-remote-server-in-ubuntu
https://help.ubuntu.com/lts/serverguide/openssh-server.html
http://linux-sys-adm.com/how-to-install-and-configure-ssh-on-ubuntu-server-14.04-lts-step-by-step/