SSH requires both the ssh user command to log in  to  other  systems,
and the sshd daemon for getting into your system from outside.


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From http://linuxg.net/how-to-enable-ssh-on-ubuntu-13-04/
Dated 2013-4-28

In this article I will show you how to  install  and  enable  ssh  on
Ubuntu 13.04 Raring Ringtail.  You have to use sudo for all of this.

On Ubuntu, when you install the  openssh-server  package,  sshd  gets
enabled by default:

$ apt-get install openssh-server

To restart the ssh service, use:

$ /etc/init.d/ssh restart

If you want to change the default settings, such as the default port,
edit the /etc/ssh/sshd_config file:

$ edit /etc/ssh/sshd_config

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