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If you want to use Hydro in 14.04, you'll have to build it from source. Hydro depends on a lot of 12.04 systems packages that will be replaced during the upgrade to 14.04, and I expect that most or all of Hydro will be uninstalled by the package manager as part of the upgrade.
I've never tried to build Hydro in Indigo, but I expect you'll have some trouble getting it to work. Why not upgrade to ROS Indigo? I think it would be easier to upgrade your packages to Indigo than it would be to get Hydro working in 14.04. After all, Hydro has been EOL for over two years.