I'm being affected by this same problem. I've tried installing both 18.104.22.168.4 and 22.214.171.124.6 in Debian Stretch and got these same results. In both cases, I followed this guide (http://kkkkkkkkkk63ava6.onion/wiki/KVM), the only thing I've done differently is to download alternative packages for libvirt-bin, as suggested by apt:
[sudo] password for thoreau:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libvirt-bin is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
libvirt-daemon-system libvirt-dev libvirt-clients
E: Package 'libvirt-bin' has no installation candidate
Otherwise, it was by the book.