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[Charles Peters II <cp@xxxxxxxxxxxxx>]

# ssh-keygen -A
ssh-keygen: generating new host keys: RSA1 ED25519 

I don't think we want to add the old RSA1 keys, just the new ED25519.

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https://bugs.launchpad.net/bugs/1300133

Title:
  Generate ED25519 host keys on upgrade

Status in “openssh” package in Ubuntu:
  Confirmed

Bug description:
  openssh (1:6.5p1-1) unstable; urgency=medium
    ...
    * Generate ED25519 host keys on fresh installations.  Upgraders who wish
      to add such host keys should manually add 'HostKey
      /etc/ssh/ssh_host_ed25519_key' to /etc/ssh/sshd_config and run
      'ssh-keygen -q -f /etc/ssh/ssh_host_ed25519_key -N "" -t ed25519'.
     ...
  -- Colin Watson <cjwatson@xxxxxxxxxx>  Mon, 10 Feb 2014 14:58:26 +0000

  Most users and many administrators are not going to notice the new
  host key capabilities when it is buried in a changelog.  We should at
  least give them a obvious hint about it.

  Even better would be to prompt the user to generate the keys with a
  debconf question like was recently done with the "Change to
  "PermitRootLogin without-password"".

  I would like to label this as a security vulnerability, but that may
  be a bit over the top, it would be a security improvement!

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