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When I execute the updater it always throws the same error saying:

Failed to download repository information. Check your internet connection. 

And when I run the sudo apt-get update I get these lines at the end:

W: Failed to fetch cdrom://Ubuntu 13.10 Saucy Salamander - Release i386 (20131016.1)/dists/saucy/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 13.10 Saucy Salamander - Release i386 (20131016.1)/dists/saucy/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 http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/saucy/main/source/Sources 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/saucy/main/binary-i386/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead
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marked as duplicate by Jorge Castro, Avinash Raj, BuZZ-dEE, Eric Carvalho, karel Feb 11 at 0:25

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2 Answers 2

Go to Settings → System → Software sources and disable all additional sources. The errors you see are because of Equinox PPA repository does not have packages for Saucy yet. And the line

Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

clearly describes what you have to do with CD-ROM.

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  1. Open Software & Updates (for example by pressing super/windows button and typing update, and clicking the icon)

  2. From Other Software: uncheck boxes for all the additional sources, which are causing errors.

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