OpenSSH is a connectivity tool for remote login with the SSH protocol.
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1. Open a terminal. Right click on your desktop, and click Open in terminal. If on server version of Ubuntu just go to the next step.
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2. Type the following command and hit ENTER to download package information from all configured sources. You may skip this step if recently done it.
$ sudo apt update
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3. Type the following command and hit ENTER to install OpenSSH.
$ sudo apt install -y openssh-server openssh-client
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4. Type the following command and hit ENTER to grant firewall access for OpenSSH.
$ sudo ufw allow ssh
You'll probably need this tool to remotely connect to your server.