Comment 9 for bug 1417051

In the meantime, workaround for those of us who aren't package maintainers is here:

http://jrs-s.net/2015/05/13/libguestfs0-and-zfs-on-linux-in-ubuntu/

TL;DR edit the deb, remove the ill-considered dependency, done (at least until the next update puts it right back again).