Installing OpenSSH server software on an Ubuntu Linux system

To set up an Ubuntu Linux system as a Secure Shell (SSH) server, you can take the following steps:

1. Open a terminal window.
2. In the terminal window, issue the command sudo apt-get install openssh-server.
3. Enable and start the ssh server service by issuing the command sudo systemctl enable ssh --now. If you wish to enable the service, but not start it immediately, you can omit the --now at the end of the command, i.e., you can use sudo systemctl enable ssh and then later issue the command sudo systemctl start ssh to start the service.

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