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When I try tp update my xubuntu in "Update Manager" I get this error:

Failed to download repository information

When I try to update through terminal I get this:

W: Failed to fetch cdrom://Xubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)/dists/precise/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://Xubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)/dists/precise/multiverse/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://Xubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)/dists/precise/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
W: Failed to fetch cdrom://Xubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)/dists/precise/universe/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.

What should I do? It hasn't been updated for 10 days.

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marked as duplicate by Mik, hhlp, Seth, Eric Carvalho, Kevin Bowen Mar 19 '13 at 0:56

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.

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Please follow the following link for an Answer to your Question.

Why is Update Manager giving "Failed to fetch CD-ROM..." errors?

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Thanks! The problem was that the "CD-ROM" option was checked in the "other software". Now it's ok :) –  morante Mar 18 '13 at 18:13
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