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When i run system update then i got following error:

W:Failed to fetch cdrom://Ubuntu 12.04.3 LTS _Precise Pangolin_ - Release amd64      (20130820.1)/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 12.04.3 LTS _Precise Pangolin_ - Release amd64 (20130820.1)/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 12.04.3 LTS _Precise Pangolin_ - Release amd64 (20130820.1)/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

W:Failed to fetch cdrom://Ubuntu 12.04.3 LTS _Precise Pangolin_ - Release amd64 (20130820.1)/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

E:Some index files failed to download. They have been ignored, or old ones used instead.

please help me on this.

Braiam
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Jaimin pandya
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  • Similar to [this](http://askubuntu.com/questions/256229/failed-to-download-repository-information-ubuntu-12-10) and [this](http://askubuntu.com/questions/240109/why-do-i-get-failed-to-download-repository-information) – dhpasta Dec 12 '13 at 18:55
  • @dhpasta : i was already used both links, But i can't able to solve this question. – Jaimin pandya Dec 12 '13 at 19:01
  • @Waldir Leoncio : same question. – Jaimin pandya Dec 12 '13 at 19:06
  • Could you **edit** your question and add the output of `cat /etc/apt/sources.list /etc/apt/sources.list.d/*` – Braiam Dec 16 '13 at 02:01

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