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[Jason Gerard DeRose <jason@xxxxxxxxxxxx>]

Also, just to clarify, this is definitely a change (or in my mind
regression) introduced by systemd. Yesterday, the System76 image master
tool worked fine and dandy with an up-to-date Vivid VM, as it has
throughout the rest of the previous Vivid dev cycle.

Today things broke.

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https://bugs.launchpad.net/bugs/1429938

Title:
  systemd changes behavior of apt-get remove openssh-server

Status in openssh package in Ubuntu:
  Confirmed

Bug description:
  On Trusty and Utopic, when you run `apt-get remove openssh-server`
  over an SSH connection, your existing SSH connection remains open, so
  it's possible to run additional commands afterward.

  However, on Vivid now that the switch to systemd has been made,  `apt-
  get remove openssh-server` closes the existing SSH connection
  immediately, causing your SSH client to exit with a non-zero status. I
  have a hunch there's a lot of automation tooling out there that relies
  on the old behavior.

  For what it's worth, this change breaks the internal image mastering
  tools that System76 uses. Prior to exporting an image tarball, I spin
  up a golden VM with qemu, rysnc a script to it, and then execute this
  script over SSH.

  The important step is that I need to remove openssh-server prior to
  shutting down the VM, so these scripts always end with something like
  this:

  apt-get -y purge openssh-server ssh-import-id
  apt-get -y autoremove
  shutdown -h now

  As far as I can tell, this behavior change will likewise be a problem
  when running `do-release-upgrade` on a remote server over SSH. Or more
  generally, anytime you run "apt-get upgrade/dist-upgrade" via SSH, it
  seems this would be a problem whenever the openssh-server package
  happens to be updated.

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