I have individually encrypted files that I would like to manipulate from the context menu of nautilus. I have nautilus and seahorse, but from my reading, it appears I also need seahorse-nautilus to bridge the two.
Is there are reason I do not see this available in the repository? This package seems too important to be omitted and I wonder if I do not understand something fundamental.
While looking for how to do this, I also saw a lot of issues with mime-associations, and I have looked at those, but I seem to need this piece before getting far enough to have that problem. 
Thanks.
Update: Nevermind. I was a Dummkopf. I was using the Software catalog rather than just using the apt command. Sorry for the noise.