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[Laxmikant Gurnalkar <laxmikant.gurnalkar@xxxxxxxxx>]

It's a really critical bug. It has wasted my  6 hours to fix this bug. I had raised a query there on askubuntu. 
http://askubuntu.com/questions/552581/unity-dash-as-well-as-terminal-is-not-coming

Reinstalling ubuntu-desktop worked for me.  Solution by given by
remyseroos (http://askubuntu.com/users/230093/remyseroos)

The current work-around is:

>From a terminal:

sudo apt-get update 
sudo apt-get install unity
dconf reset -f /org/compiz/
This will reinstall unity and reset the config.

If that doesn't works then:

sudo apt-get update
sudo apt-get install ubuntu-desktop
rm -f /home/user/.config/dconf/user
but be aware that this solution will install all of the packages from ubuntu-desktop (including things like gedit, sound utility, archive managers etc.)

Thanks

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https://bugs.launchpad.net/bugs/1292396

Title:
  After upgrade Unity session is broken

Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Triaged

Bug description:
  After yesterdays upgrade, when I log in into default session (Unity),
  there was no Panel, no Launcher, no windows decorations. there was
  Yesterday's upgrade was related to Unity packadges, so after reboot I
  logged into Gnome Flashback session - works as expected. Reboot - and
  there is no Unity session in Unity Greeter. I logged again into
  Flashback and launch Synaptic. I saw, that Unity package wasn't even
  installed, so I installed it - Unity session shows up in Greeter, but
  thaths all, still no Panel, no Launcher, etc. In CCSM Unity plugin was
  uncheck. I was able to launch window decorations, but launching Unity
  plugin caused CCSC crash. In another try there was info, that launch
  of Unity plugin is in conflict with Window Decorations plugin, but
  somehow launching Unity plugin does nothing, but Compiz crash
  (https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1292393).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140313-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: i386
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,resize,gnomecompat,regex,imgpng,move,commands,mousepoll,vpswitch,animation,place,wall,unitymtgrabhandles,grid,wobbly,fade,expo,workarounds,session,scale,ezoom]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Fri Mar 14 08:26:59 2014
  DistUpgraded: 2013-11-26 21:17:59,613 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RS880 [Radeon HD 4200] [1002:9710] (prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. Device [1462:7576]
  MachineType: MICRO-STAR INTERNATIONAL CO.,LTD MS-7576
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-17-generic root=UUID=23985ff5-112f-4dab-9da1-5c21397013fe ro splash quiet vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2013-11-26 (107 days ago)
  dmi.bios.date: 11/27/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V3.9
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 785G-E53 (MS-7576)
  dmi.board.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV3.9:bd11/27/2010:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7576:pvr1.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rn785G-E53(MS-7576):rvr1.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr1.0:
  dmi.product.name: MS-7576
  dmi.product.version: 1.0
  dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
  version.compiz: compiz 1:0.9.11+14.04.20140310-0ubuntu1
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Fri Mar 14 08:13:38 2014
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        Microsoft Microsoft® 2.4GHz Transceiver v8.0 KEYBOARD, id 8
   input        Microsoft Microsoft® 2.4GHz Transceiver v8.0 KEYBOARD, id 9
   input        Microsoft Microsoft® 2.4GHz Transceiver v8.0 KEYBOARD, id 10
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.0-1ubuntu7
  xserver.video_driver: radeon

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