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[ubuntu] problem with uodates

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linux-howto

http://ubuntuforums.org – hi today i opened my terminal and wanted to uodate my ubuntu so i typed the following command sudo apt-get update but i get error in terminal window W : Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)/dists/oneiric/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 E: Some index files failed to download. They have been ignored, or old ones used instead. what does this mean (Hardware)