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Possible Duplicate:
Failed to download repository information due to missing CDROM

This is basically what I'm getting after trying to add repositories so that I can add lenses. Any help would be greatly appreciated.

W: Failed to fetch cdrom://Ubuntu 12.04LTS _Precise Pangolin_ - Release amd64 (20120425)/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  404  Not Found

There's more that I'm guessing aren't too dubious. Very similar to the others. Again, any help would be appreciated.

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marked as duplicate by jokerdino, LnxSlck, Anwar Shah, Jorge Castro, hexafraction Sep 21 '12 at 19:17

This question was marked as an exact duplicate of an existing question.

The source url is invalid. It dowsn't contain any files. That's why it is failing.

Follow this URL -

You can see there are no files.

Probably you are following some outdated instruction to install some specific lenses.

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