unity crashed with AttributeError in process_and_start_unity(): 'Values' object has no attribute 'ignore_session_manager'

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ProblemType: Crash
DistroRelease: Ubuntu 16.10
Package: unity 7.5.0+16.10.20160906.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7
Uname: Linux 4.8.0-17-generic i686
NonfreeKernelModules: wl
.tmp.unity_support_test.0:

ApportVersion: 2.20.3-0ubuntu7
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Sun Oct 2 18:14:09 2016
DistUpgraded: 2016-10-02 12:23:19,952 DEBUG entry '# deb http://dl.google.com/linux/talkplugin/deb/ stable main # disabled on upgrade to yakkety' was disabled (unknown mirror)
DistroCodename: yakkety
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.248+bdcom, 4.4.0-38-generic, i686: installed
 bcmwl, 6.30.223.248+bdcom, 4.8.0-17-generic, i686: installed
ExecutablePath: /usr/bin/unity
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] 4th Gen Core Processor Integrated Graphics Controller [1025:093b]
GsettingsChanges:
 b'org.compiz.core' b'active-plugins' b"['core', 'composite', 'opengl', 'imgpng', 'grid', 'wall', 'commands', 'unitymtgrabhandles', 'compiztoolbox', 'regex', 'snap', 'mousepoll', 'resize', 'animation', 'vpswitch', 'move', 'expo', 'copytex', 'place', 'session', 'workarounds', 'ezoom', 'fade', 'scale', 'unityshell']"
 b'org.gnome.desktop.interface' b'scaling-factor' b'uint32 1'
InstallationDate: Installed on 2016-09-10 (22 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release i386 (20160719)
InterpreterPath: /usr/bin/python3.5
ProcCmdline: /usr/bin/python3 /usr/bin/unity
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-17-generic root=UUID=b7dd4608-6915-4e10-8701-5dfd0c74da89 ro quiet splash vt.handoff=7
PythonArgs: ['/usr/bin/unity']
SourcePackage: unity
Title: unity crashed with AttributeError in process_and_start_unity(): 'Values' object has no attribute 'ignore_session_manager'
UpgradeStatus: Upgraded to yakkety on 2016-10-02 (0 days ago)
UserGroups:

dmi.bios.date: 07/29/2014
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.02
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: BA41_HWS
dmi.board.vendor: Acer
dmi.board.version: Type2 - A01 Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.02:bd07/29/2014:svnAcer:pn:pvrTBDbyOEM:rvnAcer:rnBA41_HWS:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.version: TBD by OEM
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.13.0+16.10.20160818.2-0ubuntu2
version.libdrm2: libdrm2 2.4.70-1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6
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: Sun Oct 2 18:45:31 2016
xserver.configfile: default
xserver.errors:

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