Sometimes an app isn't there for your architecture. This happens now and then for AMD64. It can be handy to chroot into x86 and symlink to the x86 app afterwards. Also, despite Ubuntu's stability, catastrophic failures do happen, and when they do it is important to have a backup so that your data can be recovered. This HowTo goes over creating an image of your installation so that you can restore your system if needed with all the programs and updates already installed. Elsewhere, Kubuntu Flight 5 was released.