Public bug reported:

Binary package hint: unity

When you drag an item (e.g. Netbeans dock) over the unity launcher and
then you press esc to cancel the drag, the destop stays with only the
window that was visible (the window whose icon you were hovering when
you pressed esc). The mouse does nothing, and any new window you may
open using the keyboard flashes on the screen and disappears. There is
no choice then but to shut down by cutting the power.

Technically it seems that esc terminates the drag, but the overlay that
shows only the window over whose icon the mouse was hovered waits for a
drop event, which is unable to receive.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.12-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  270.41.06  Mon Apr 18 14:53:56 
PDT 2011
 GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,session,snap,imgpng,regex,grid,compiztoolbox,imgsvg,vpswitch,staticswitcher,gnomecompat,mousepoll,resize,move,unitymtgrabhandles,animation,resizeinfo,wall,shelf,fade,workarounds,expo,addhelper,animationaddon,scale,scaleaddon,unityshell]
CompositorRunning: compiz
Date: Mon May  9 14:19:49 2011
DistUpgraded: Log time: 2011-04-28 14:52:42.035299
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 nVidia Corporation G98 [Quadro FX 370M] [10de:06fb] (rev a1) (prog-if 00 [VGA 
controller])
   Subsystem: Dell Device [1028:0234]
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
InstallationMedia_: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
InstallationMedia__: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
JockeyStatus:
 xorg:nvidia_173 - NVIDIA accelerated graphics driver (Proprietary, Disabled, 
Not in use)
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, 
Enabled, Not in use)
MachineType: Dell Inc. Precision M2400
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic 
root=UUID=95618597-0b1a-4a49-b3ad-c0025f4b995d ro quiet splash nomodeset 
video=uvesafb:mode_option=1400x900-24,mtrr=3,scroll=ywrap vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-8.42-generic 2.6.38.2
ProcVersionSignature__: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Renderer: Unknown
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-04-28 (10 days ago)
dmi.bios.date: 07/30/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A22
dmi.board.name: 0U698R
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA22:bd07/30/2010:svnDellInc.:pnPrecisionM2400:pvr:rvnDellInc.:rn0U698R:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Precision M2400
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110107+b795ca6e-0ubuntu7

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


** Tags: amd64 apport-bug compiz-0.9 natty running-unity ubuntu

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https://bugs.launchpad.net/bugs/779865

Title:
  desktop not responding after escaping a drag to the unity launcher

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