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It looks like it's trying to pull from quantal sources and thus can't find precise dependencies. Did you leave off the 'http:' from your commands? It should be

sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu precise main" > /etc/apt/sources.list.d/ros-latest.list

You should copy and paste from the tutorial rather than typing it in.

If that doesn't work, maybe try the answer to this question. Good luck!