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Hi, I just ran into this same problem yesterday but was able to eventually get Hydro installed.

I had a number of dependencies which were a minor revision beyond what was compatible with Hydro, I used aptitude to correct them. You can use aptitude to install the missing packages until you get to the point where it reports no changes will be made, at that point if you select 'no' for the proposed configuration aptitude should suggest alternative dependencies.

It can be helpful to walk down the dependency tree to find the unmet/conflicting dependencies using apt-get.

e.g. if apt-get install ros-hydro-desktop-full fails, try apt-get install for the first unmet dependency listed, in this case that would be ros-hydro-desktop. Continue trying to apt-get install the first unmet dependency listed until you finally reach the underlying conflict, at that point aptitude can be useful for suggesting an alternative.