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This question already has an answer here:

Duplicate sources.list entry saucy/restricted amd64 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_saucy_restricted_binary-amd64_Packages)
W: Duplicate sources.list entry saucy/restricted i386 Packages (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_saucy_restricted_binary-i386_Packages)
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marked as duplicate by Mitch, Rinzwind, Braiam, karel, minerz029 Dec 1 '13 at 6:22

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

You can build a default file following the procedure:

  1. Move older file

    sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak

  2. Then open software-properties-gtk to build a new one. Type the below command in a terminal


In the window

Select all four catagory in Ubuntu Software tab

Select precise-security, precise-updates and precise-backports catagory in Updates tab.

Select Canonical partner and Intependent catagory from Other software tab.

That's it. Now you will have a new deafault error free sources.list file.

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