Public bug reported:

Changing the sshd_config file to use exclusively the ed25519 host key
type causes the server to reject all connections.

Excerpt from my config file:
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/Japan_ssh_host_ed25519_key

I tried setting each one individually then restarting the sshd service
and it only states that the connection has been reset when I use

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: openssh-server 1:7.5p1-10ubuntu0.1
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Feb  4 04:36:44 2018
InstallationDate: Installed on 2017-11-30 (66 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
 PATH=(custom, no user)
SourcePackage: openssh
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug artful wayland-session

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  All host keys work except ed25519

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