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[Egmont Koblinger <egmont@xxxxxxxxx>]

>  perhaps "(sleep 3; poweroff ) &"?

I recently did something similar, and noticed that the ssh channel
doesn't close as long as the background process's file descriptors use
the ssh channel.  So you'll probably have more luck with:

(sleep 3; poweroff) </dev/null &>/dev/null &

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

Title:
  reboot does not return under systemd

Status in systemd package in Ubuntu:
  Invalid

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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