SSH stands for Secure Shell. It's a method for connecting to remote places.

As a developer, you will need a SSH client in combination with a SSH key in order upload changes to Ubuntu source.

First, make sure you have install the SSH client:

$ sudo apt-get install openssh-client

Creating the SSH Key in a Terminal

To create a SSH key in a terminal:

$ ssh-keygen -t rsa

Read more about SSH at the Ubuntu Community Wiki