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Whenever I insert an Ubuntu/XUbuntu CD into my XUbuntu PC the system recognizes it as a package repository. I dislike this behaviour as it is generally useless (except for those people having no broadband Internet connection) and prevents me from erasing and reusing the CD-RW. Can I disable this functionality?

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Does this still happen with the CD entries in /etc/apt/sources.list commented out (by putting # in front of these lines)? You can press Ctrl+Alt+T to open an xfce4-terminal window, run sudo cp /etc/apt/sources.list /etc/apt/sources.list.old to back it up, and then gksu mousepad /etc/apt/sources.list to edit it as root. (These instructions are Xubuntu-specific.) I'm posting this as a comment rather than an answer because I don't actually think this is always sufficient to prevent the behavior you're describing...but it's important to check first, in case this is sufficient. – Eliah Kagan May 27 '12 at 19:24
In 12.04, mousepad is replaced by leafpad. so, the command will be gksu leafpad /etc/apt/sources.list – Anwar Shah Jul 26 '12 at 6:14

I think (97% sure) you are referring to this message box.

Distribution upgrade message box

To disable it, open a terminal and run the command below. (Then log out and log in again, to see that this annoying message box no longer appears.)

gsettings set com.ubuntu.update-notifier auto-launch false 

Ubuntu (though not Xubuntu) also provides a neat graphical graphical way to do this:

Go to System Settings --> Details --> Removable Media --> Software and select Do nothing.

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