I have a Raspberry Pi 3 with a 32 GB SD card. I put a pre-made image with an emulation station on. It launches the emulation station on boot and I installed the desktop so that I can use the Pi like a normal one running Raspbian when I want to.
My problem is that I don't have all of the programs that come default with a Rapsbian image. I really like the way I have the emulation station set up so I want to know how to install the programs without having to redo all the customisation and games on the Pi.