I'm not spotting an obvious notation in debian/changelog for dropping the ntru package, but I'm guessing there was a reason, since this clearly did exist in the xenial and bionic packages. Subscribing ubuntu-server for now for further investigation as time permits, but if anyone can ascertain the Debian history of this and report on this bug, then we can re-triage and prioritize accordingly.
I'm not spotting an obvious notation in debian/changelog for dropping the ntru package, but I'm guessing there was a reason, since this clearly did exist in the xenial and bionic packages. Subscribing ubuntu-server for now for further investigation as time permits, but if anyone can ascertain the Debian history of this and report on this bug, then we can re-triage and prioritize accordingly.