[Bug 1814124] Re: sshd does not start after update on non-Ubuntu kernels where fchownat() is broken

[Christian Ehrhardt ]

*** This bug is a duplicate of bug 1811580 ***
    https://bugs.launchpad.net/bugs/1811580

Same discussion and more in bug 1811580 marking as dup to have people
finding this bug all get to the same main bug.

** This bug has been marked a duplicate of bug 1811580
   systemd fails to start sshd at reboot

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https://bugs.launchpad.net/bugs/1814124

Title:
  sshd does not start after update on non-Ubuntu kernels where
  fchownat() is broken

Status in openssh package in Ubuntu:
  Invalid

Bug description:
  [Triage Notes]

  This issue is caused on Ubuntu derivatives due to problematic symlink
  handling on those systems. See bug 1804847 for details, and comment 10
  below for details and a workaround.

  Proper Ubuntu systems do not appear to be affected.

  [Original Description]

  After processing system update by:
  apt-get clean && apt-get autoclean && apt-get autoremove && apt-get update && apt-get upgrade && apt-get dist-upgrade && reboot

  ssh server stops starting at system boot.

  It starts after doing:
  mkdir /var/run/sshd
  chmod 0755 /var/run/sshd
  service ssh start

  It happens on fresh Ubuntu-16.04 installs on every VPS provide I have
  tested so far.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: openssh-server 1:7.2p2-4ubuntu2.6
  Uname: Linux 2.6.32-042stab127.2 x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Thu Jan 31 10:18:56 2019
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
  SSHDConfig: Error: command ['/usr/sbin/sshd', '-T'] failed with exit code 255: Missing privilege separation directory: /var/run/sshd
  SourcePackage: openssh
  UpgradeStatus: No upgrade log present (probably fresh install)

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