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When I run the command sudo apt-get update I get the following error:

W: Failed to fetch http://archive.canonical.com/ubuntu/dists/raring/Release    
Unable to find expected entry 'precise/source/Sources' in Release file (Wrong 
sources.list entry or malformed file)
W: Failed to fetch http://archive.canonical.com/raring/dists/precise/partner/source/Sources  404 Not Found 
W: Failed to fetch http://archive.canonical.com/raring/dists/precise/partner/binary-amd64/Packages 404  Not Found 
W: Failed to fetch http://archive.canonical.com/raring/dists/precise/partner/binary-i386/Packages 404  Not Found 
E: Some index files failed to download. They have been ignored, or old ones used       instead.

Can someone help me to solve these errors ?

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Can you add the contents of /etc/apt/sources.list, to your question? –  Mitch Aug 3 '13 at 7:27

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