This bug was fixed in the package openssh - 1:8.0p1-2

---------------
openssh (1:8.0p1-2) experimental; urgency=medium

  * Fix interop tests for recent regress changes.

 -- Colin Watson <cjwat...@debian.org>  Fri, 14 Jun 2019 14:32:12 +0100

** Changed in: openssh (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1661745

Title:
  ssh-keyscan does not exit with non-zero return code on error

Status in portable OpenSSH:
  Unknown
Status in openssh package in Ubuntu:
  Fix Released
Status in openssh package in Debian:
  Fix Released

Bug description:
  On xenial, ssh-keyscan returns zero indicating success, when the
  command fails.

  root@cp1:~# lsb_release -d
  Description:  Ubuntu 16.04.1 LTS

  root@cp1:~# ssh-keyscan -H -t ssh-rsa bad-host
  getaddrinfo bad-host: Name or service not known
  root@cp1:~# echo $?
  0

  On trusty, the exit status is non-zero as expected.

  root@integration-deployer:/home/ubuntu# lsb_release -d
  Description:  Ubuntu 14.04.5 LTS

  root@integration-deployer:/home/ubuntu# ssh-keyscan -H -t ssh-rsa bad-host
  getaddrinfo bad-host: Name or service not known
  root@integration-deployer:/home/ubuntu# echo $?
  255

  This is a incompatibility between Ubuntu 14.04 and 16.04

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