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On top of Hendrix's suggestion (meaning after you do an apt-get update) you might also want to try this:
apt-get --download-only
in order to force Ubuntu to download all of your stuff first; No install will take place. If the operation fails here, then, yes, it is a repository error. If it succeeds, move to the regular apt-get install and check if the error happens again.
Honestly, Hydro on Ubuntu 12.04 is VERY vanilla. Shouldn't fail at all.
Just in case, post you entire apt-get command, so we know what you are installing.