Linux Articles listed under "fix"
How to remove the Ubuntu eject CD prompt. The following tutorial covers the process of removing the "Please remove the disk, close the tray (if any) and press ENTER to continue" prompt entirely from your USB Ubuntu installation. The process is fairly simple and will allow your system to shutdown or restart without prompting you to remove the CD. Those of us booting from a USB stick, will surely be glad to get rid of the remove CD annoyance.