This does not require landscape-client. It can be reproduced via:

 * Install machine with 14.04.5 and fully upgrade it.
 * Execute 'do-release-upgrade' to upgrade to 16.04.
 * When the upgrade is finished, exit the release upgrade tool (do not allow 
the tool to reset the system).
 * Manually attempt to reboot the system with "sudo /sbin/shutdown -r"

The machine will not reboot and the shutdown command will exit with:
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

/var/log/* logs are attached.

** Attachment added: "lp-1670291.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/landscape-client/+bug/1670291/+attachment/4838519/+files/lp-1670291.tar.gz

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

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

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