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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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


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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