Calibre is normally used as a desktop app that has a server component. Since I was installing this on a headless server I would not be able to do the setup that way. There is a full command line interface and I found a guide that helped with this process at Digital Ocean. Note that if you watch the video, I mistakenly followed the 14.04 guide so the "xvfb-run" part of the commands are no longer necessary and I have omitted that from the text version here.