Install OpenSSH Server on Ubuntu
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Firstly you need to log in to Ubuntu.

Execute Command:
sudo apt-get install openssh-server

Enter password:

OpenSSH Server being installed...

OpenSSH Server has been installed:

You need to restart the SSH service, use the following command:
sudo service ssh restart

SSH Service has been restarted:

Now everything is ready you can use tools such as PuTTY to connect SSH Server.