Problema no apt-get update - Ubuntu 12.04? [duplicado]

Question

Como resolver a seguinte mensagem de erro?

Mensagem de erro:

W:Failed to fetch cdrom://Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/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 amd64 (20120823.1)/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://Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/dists/precise/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 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/dists/precise/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, 
E:Some index files failed to download. They have been ignored, or old ones used instead.

    

Answer 1

gerenciador de atualizações aberto vá para configurações - > o software do Ubuntu e desmarque o seu CDROM então vá para outro software e desmarque todos os CDROMs