Summarizing yesterday's discussion with the Security Team:
 - we would like password auth disabled by default on installation of 
openssh-server via the server image, just as via the cloud image
 - the admin can set up password auth post-install
 - (optional) this can be a debconf question, so that the admin can pre-seed 
enabling of password auth at install time.
 - with the above requirements met, the Security Team is ok with having 
openssh-server installed by default, and listening on port 22, on a server 
install as well as on a cloud image.
 - no requirements were expressed on the behavior of openssh-server if manually 
installed by the admin post installation.
 - (optional) ideally, the openssh-server systemd units would be adjusted for 
lazy socket-based activation, so that this is not an additional server process 
running (and taking up swap space / process table space) until asked for.

Opening a task on the openssh package.

** Also affects: openssh (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1576353

Title:
  install openssh-server by default, prompt for enabling it on server
  iso install

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