OpenSSH is a free and open-source implementation of the Secure Shell (SSH) communication protocol. It is used to secure remote connections to servers, allowing users to remotely access, manage, and transfer files between systems. OpenSSH includes various tools and utilities such as ssh, scp, and sftp, which enable secure communication between systems over a network. It is commonly used to remotely access servers and other network devices, as well as to securely transfer files between systems.

To configure OpenSSH on Ubuntu 20.04, follow these steps:

  1. Update the package manager’s package list by running sudo apt update.
  2. Install OpenSSH by running sudo apt install openssh-server.
  3. Check the status of the OpenSSH service by running systemctl status ssh. The service should be active and running.
  4. If the OpenSSH service is not running, start it by running sudo systemctl start ssh. To start the service automatically at boot, run sudo systemctl enable ssh.
  5. To make any changes to the OpenSSH configuration, edit the file /etc/ssh/sshd_config.
  6. To apply the changes, restart the OpenSSH service by running sudo systemctl restart ssh.

That’s it! You should now be able to connect to your Ubuntu 20.04 machine using an SSH client, such as ssh from the command line or a graphical client like PuTTY.

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