[Bug 1670291] Re: Landscape: Upgrade 14.04.5 to 16.04.2 fails unable to reboot

[Dave Jones]

@xnox Scheduling with /sbin/shutdown normally does work ... however,
what we're dealing with here is the anomalous situation of an instance
which starts off as trusty and is upgraded to xenial. During the upgrade
process, the /sbin/shutdown implementation is changed from the upstart
one to the systemd one. At the end of the process, /sbin/shutdown is
(unsurprisingly) a link to systemctl ... but it doesn't work because
it's expecting to be able to talk to systemd which isn't fully
operational until a reboot. As Landscape is expecting to be able to
reboot via /sbin/shutdown the user relying on Landscape in such a
scenario finds themselves in a bit of a bind (having to have some other
means of dealing with the server, like SSH).

However, /sbin/reboot and /sbin/poweroff *do* work in this (admittedly
rare) scenario, hence the patches committed for this issue leave the
system using /sbin/shutdown by default but if/when it fails, they fall
back to trying /sbin/reboot or /sbin/poweroff (as appropriate) instead.

As to why -h is used instead of -P, in systemd's implementation of
/sbin/shutdown they're exactly the same thing. In the upstart
implementation it's more vague; quoting from the man-page: "Requests
that the system be either halted or powered off after it has been
brought down, with the choice as to which left up to the system". I'm
not sure what that means in practice though!

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https://bugs.launchpad.net/bugs/1670291

Title:
  Landscape: Upgrade 14.04.5 to 16.04.2 fails unable to reboot

Status in landscape-client package in Ubuntu:
  Fix Committed
Status in systemd package in Ubuntu:
  Incomplete
Status in landscape-client source package in Xenial:
  Confirmed
Status in systemd source package in Xenial:
  Incomplete

Bug description:
  Used Landscape (Paid Canonical Subscription) to upgrade one of my
  machines.

  Landscape only shows "In Progress" for more than 8 hours now and asked
  for a reboot of the machine in a second alert.

  In the reboot attempt I get the message:
  =========================
  Failed to set wall message, ignoring: Method "SetWallMessage" with signature "sb" on interface "org.freedesktop.login1.Manager" doesn't exist
  Failed to call ScheduleShutdown in logind, proceeding with immediate shutdown: Method "ScheduleShutdown" with signature "st" on interface "org.freedesktop.login1.Manager" doesn't exist
  =========================

  Steps to reproduce:
  * Fully updated 14.04.5 machine
  * Open Landscape
  * Choose the machine
  * Choose Packages
  * This computer can be upgraded to a newer release
  * Apply
  * Wait 2 hours
  * Alert comes in a seperate Landscape message Machine is ready for reboot
  * Choose Info... Power
  * Deliver to selected computers as soon as possible
  * Error message

  I found this thread on reddit about this issue maybe the solution can be built into the upgrade script
  https://www.reddit.com/r/linuxquestions/comments/4wy3go/trying_to_run_as_user_instance_but_the_system_has/

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