OpenSSH (Open Secure Shell) is a set of computer programs providing encrypted communication sessions over a computer network using the SSH protocol.

Installing OpenSSH for Ubuntu

From the Ubuntu desktop:

1. Go to System > Administration > Synapatic Package Manager
2. Search for "openssh-server" and "Mark for installation"
3. Click on the "Apply" to install

From the command line:

$ sudo apt-get install openssh-server

Configuration Files

The configuration files for OpenSSH is located in:

/etc/ssh

Disabling SSH Root Logins

Edit the /etc/ssh/sshd_config file and set the PermitRootLogin parameter to no.