I have found references to this in previous versions of Ubuntu but nothing in 13.04. Basically I go to install my previous purchases and there is nothing there. I am logged into Ubuntu One so that should not be a problem. I can look up one of my purchases directly music tube for instance. It marks it as already purchased next to the item. When I click on it for more information I get the following message "There isn’t a software package called “musictube” in your current software sources."
Any ideas how to fix this?