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.
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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.

Norrius
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