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When I ran sudo apt-get update then I found some error. The Error is like below:

W: Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130424)/dists/raring/main/binary-amd64/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
W: Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130424)/dists/raring/restricted/binary-amd64/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
W: Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130424)/dists/raring/main/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
W: Failed to fetch cdrom://Ubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130424)/dists/raring/restricted/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
E: Some index files failed to download. They have been ignored, or old ones used instead.

Could anyone please help me why I am getting this kind error message? I've just found the Error message today on my machine

marked as duplicate by Jorge Castro, Mitch, Radu Rădeanu, Eliah Kagan, Warren Hill Jul 16 '13 at 5:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Just sudo gedit /etc/apt/sources.list and remove/comment the lines that contain cdrom. It would be advisable to show us the contents of /etc/apt/sources.list, just in case. – edwin Jul 16 '13 at 1:06
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You can also copy and paste this command into the terminal (ctrl+alt+t) to open the terminal, then paste:

gksu software-properties-gtk

a window will open type in your user password then uncheck the CD-ROM boxes under the 'Other Software' tab. Close the program when you're done, and it should prompt you to reload the sources lists do that and it should work.

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