install ssh ubuntu 20.04
# Open the terminal with Ctrl+Alt+T and install the openssh-server
# package:
sudo apt update
sudo apt install openssh-server
# Once the installation is complete, the SSH service will start
# automatically. You can verify that SSH is running by typing:
sudo systemctl status ssh
# Ubuntu ships with a firewall configuration tool called UFW.
# If the firewall is enabled on your system, make sure to open
# the SSH port:
sudo ufw allow ssh