Add repository to sources.list file in Ubuntu

Here is an example of how to add a sources.list file to the Ubuntu packages repository. Open a terminal window and enter the commands below.

$ sudo cp -p /etc/apt/sources.list /etc/apt/sources.list_backup <enter>
$ sudo vi /etc/apt/sources.list <enter>
Now add the line:
deb raring main <enter>
$ sudo apt-get update <enter>

Now you can install speed-dreams using the apt-get install command