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 http://ppa.launchpad.net/speed-dreams/ppa/ubuntu raring main <enter>
:wq
$ sudo apt-get update <enter>
Now you can install speed-dreams using the apt-get install command
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