Digging a bit further, I think this arises because ssh-keysign punts off all its host key processing to openSSL, but openSSL does not support ED25519 keys.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1389167 Title: HostbasedAuthentication produces spurious warnings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1389167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs