Public bug reported:

Steps:
1. Install Yakkety, boot to desktop, dist-upgrade to the latest state.
2. Press the power button to bring up the session menu, select the "poweroff" 
option with left arrow key and hit enter.

Expected result:
 - System should poweroff normally.

Actual result:
 - Session menu closed but nothing happened. Tested with -updates and 
-proposed, they're all the same.

Attachment is a recording for this issue.
Please note that this issue is not 100% reproducible, sometimes even selecting 
poweroff option with mouse click will fail too.

Error log could be found in syslog:
Jan  5 23:47:28 ubuntu-Latitude-7370 unity-settings-[1485]: Failed to call 
Shutdown on session manager: 
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._g_2dio_2derror_2dquark.Code19: 
Operation was cancelled

More complete log:
Jan  5 23:47:25 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:25 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:25 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:25 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:25 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:25 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:26 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: WARNING: Client '/org/gnome/SessionManager/Client1' 
failed to reply before timeout
Jan  5 23:47:26 ubuntu-Latitude-7370 gnome-session-binary[1498]: WARNING: 
Client '/org/gnome/SessionManager/Client1' failed to reply before timeout
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: Entering 
running state
Jan  5 23:47:28 ubuntu-Latitude-7370 unity-settings-[1485]: Failed to call 
Shutdown on session manager: 
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._g_2dio_2derror_2dquark.Code19: 
Operation was cancelled
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session[1498]: 
gnome-session-binary[1498]: GLib-GObject-CRITICAL: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: 
GLib-GObject-CRITICAL: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Jan  5 23:47:28 ubuntu-Latitude-7370 gnome-session-binary[1498]: Entering 
running state
Jan  5 23:47:28 ubuntu-Latitude-7370 unity-panel-ser[1612]: menus_destroyed: 
assertion 'IS_WINDOW_MENU(wm)' failed

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: unity 7.5.0+16.10.20161112-0ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-34.36-generic 4.8.11
Uname: Linux 4.8.0-34-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Thu Jan  5 23:44:34 2017
DistUpgraded: Fresh install
DistroCodename: yakkety
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation HD Graphics 515 [8086:191e] (rev 07) (prog-if 00 [VGA 
controller])
   Subsystem: Dell HD Graphics 515 [1028:071b]
InstallationDate: Installed on 2017-01-06 (0 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
MachineType: Dell Inc. Latitude 7370
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-34-generic.efi.signed 
root=UUID=24624713-9336-4ae2-bf4a-e84906f0a72a ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/31/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.9.3
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.9.3:bd10/31/2016:svnDellInc.:pnLatitude7370:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude 7370
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.13.0+16.10.20160818.2-0ubuntu2
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160706-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2
xserver.bootTime: Thu Jan  5 23:38:58 2017
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-1ubuntu6.1
xserver.video_driver: modeset

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 201601-20440 amd64 apport-bug compiz-0.9 package-from-proposed 
taipei-lab ubuntu yakkety

** Attachment added: "out-2.ogv"
   https://bugs.launchpad.net/bugs/1654484/+attachment/4800683/+files/out-2.ogv

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https://bugs.launchpad.net/bugs/1654484

Title:
  Failed to poweroff system with session menu by selecting poweroff
  option with arrow key

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