In this chapter from the ExtremeTech book Hacking Ubuntu: Serious Hacks Mods and Customizations you'll learn how to set up the operating system to your taste
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The startup music is one of the easiest items to change. From the menu at the top, select System > Preferences > Sound. This brings up the Sound Preferences applet (see Figure 1). From here, you can assign sounds to system events. For example, I have a blood-curdling scream for error messages, and a telephone ringing for question dialog boxes.