Which files do I need to download to allow Ubuntu 9.04 to play files that are in the mp3 format? The Ubuntu is not connected to the internet, so I have to boot into another OS in order to download the files first and then transfer them by flash drive to Ubuntu. I will have to do this every time the computer boots. How do I get all the necessary files, and where do I put them? Also, will it be likely that it will be possible to play DVDs on Ubuntu if I install it to the HD? Also, is it possible to put the ISO image on the HD and then boot from the DVD and then switch to using the image stored on the hard drive?