Compiz keeps the system from shutting down

[David Prieto]

Binary package hint: compiz

I'm using Compiz on Natty. Whenever I try to shut down the system or log out any other way, I get a message telling me that a program (Compiz) is still running but not responding. I'm attaching a screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: compiz 1:0.9.2.1+glibmainloop2-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.37-7.18-generic 2.6.37-rc3
Uname: Linux 2.6.37-7-generic i686
Architecture: i386
CompizPlugins: [core,ccp,move,resize,place,decoration,dbus,mousepoll,gnomecompat,png,svg,imgjpeg,text,commands,neg,wall,snap,animation,scale,scaleaddon,expo,staticswitcher,regex,resizeinfo,workarounds,ezoom,vpswitch,fade,session]
Date: Tue Nov 30 23:29:52 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MachineType: Acer, inc. Aspire 5920G
PackageArchitecture: all
PciDisplay: 01:00.0 VGA compatible controller [0300]: nVidia Corporation G86 [GeForce 8600M GS] [10de:0425] (rev a1) (prog-if 00 [VGA controller])
ProcEnviron:
 LANG=es_ES.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.37-7-generic root=UUID=74fafd25-c912-49f5-b0ca-7346b16450a8 ro quiet splash
RelatedPackageVersions:
 xserver-xorg 1:7.5+6ubuntu3b1
 libgl1-mesa-glx 7.9+repack-1ubuntu2
 libdrm2 2.4.22-2ubuntu1
 xserver-xorg-video-intel 2:2.13.901-2ubuntu1
 xserver-xorg-video-ati 1:6.13.2-1ubuntu2
SourcePackage: compiz
XorgConf: Error: [Errno 2] No existe el archivo o directorio: '/etc/X11/xorg.conf'
dmi.bios.date: 02/20/2008
dmi.bios.vendor: Acer
dmi.bios.version: v1.3810
dmi.board.name: Chapala
dmi.board.vendor: Acer, Inc.
dmi.board.version: Not Applicable
dmi.chassis.type: 1
dmi.chassis.vendor: Acer, Inc.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAcer:bvrv1.3810:bd02/20/2008:svnAcer,inc.:pnAspire5920G:pvrNotApplicable:rvnAcer,Inc.:rnChapala:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A:
dmi.product.name: Aspire 5920G
dmi.product.version: Not Applicable
dmi.sys.vendor: Acer, inc.
glxinfo: Error: [Errno 2] No existe el archivo o directorio
system: distro = Ubuntu, architecture = i686, kernel = 2.6.37-7-generic