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This question already has an answer here:

Updater keep saying:

Failed to download repository information.
Check your Internet connection.


W:Failed to fetch  404  Not Found,
W:Failed to fetch  404  Not Found,
W:Failed to fetch  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 belacqua, karel, Eric Carvalho, chronitis, Avinash Raj Feb 27 '14 at 16:19

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

I tried changing Download from: Offical and now but still failed. – Jonthue Michel May 3 '13 at 22:57

Same thing happened to me. I went to the software updater setting -> Other Software tab and found those PPAs and removed them.It should work.

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