System doesn't update

[ravenforwolf]

When i try to open and download the file, this message appear. Where is the problem?

W:Failed to fetch cdrom://Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release i386 (20120817.3)/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://Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release i386 (20120817.3)/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
, E:Some index files failed to download. They have been ignored, or old ones used instead.

[papibe]

Hi ravenforwolf.

Could you post the result of this command?

find /etc/apt -name '*.list' -exec bash -c 'echo -e "\n$1\n"; cat -n "$1"' _ '{}' \;
Regards.