Ubuntu Operation Techniques

How to Enable SSH on Ubuntu 18.04

Install SSH Sever

sudo apt update
sudo apt install openssh-server
sudo systemctl status ssh

Connecting to SSH Over LAN

ssh username@ip_address

Check IP address

ip a

Connecting to SSH Over Internet

Check the public IP address by using: https://ifconfig.co/ip

Disabling and Enabling SSH on Ubuntu

To disable SSH
sudo systemctl stop ssh

To start again
sudo systemctl start ssh

To disable SSH service to start during system boot
sudo systemctl diable ssh

To enable it again
sudo systemctl enalbe ssh