now that you have properly burned things and flashed other things, it is time to install ubuntu server. this is a pretty simple process and i would recommend just using the automatic install, but if you only want to use some of the space on the hard drive then that is fine, but i wont go into detail about that because it is too much(by the way if you do a manual install swap space is not the space that you store files on, i learned that the hard way)