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This question already has an answer here:

W: Failed to fetch http://ppa.launchpad.net/docky-core/stable/ubuntu/dists/raring/main/source/Sources  404  Not Found
W: Failed to fetch http://ppa.launchpad.net/docky-core/stable/ubuntu/dists/raring/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

marked as duplicate by Eric Carvalho, Mitch, Warren Hill, Alaa Ali, user117103 Sep 22 '13 at 17:01

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If you follow these links, you can find out they are indeed missing. There is, however, a repo for precise. So I would suggest looking into /etc/apt/sources.list (Alt+F2 - gksu gedit /etc/apt/sources.list) for this repository line and changing there raring to precise. Then sudo apt-get update one more time to see if this made desired effect.

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