Public bug reported:

At login, Unity fails to start, leaving me with just the top panel,
permanently showing the Desktop menus, and the Desktop itself, but no
launcher, no dash, no indicators and no keyboard shortcuts. The Desktop
itself works, for example I can create a folder, open it and then open a
file from Nautilus. Applications launched this way seem to work
correctly, but no window management function is available.

If I run compiz --replace in a terminal from a Unity 2D session, I get
this:

Checking if settings need to be migrated ...no
Checking if internal files need to be migrated ...no
Backend     : gconf
Integration : true
Profile     : default
Adding plugins
Skipping upgrade com.canonical.unity.unity.01.upgrade
Skipping upgrade com.canonical.unity.unity.02.upgrade
Initializing core options...done
GConf Error: Configuration server couldn't be contacted: D-BUS error: 
Connection is closed
GConf Error: Configuration server couldn't be contacted: D-BUS error: 
Connection is closed
GConf Error: Configuration server couldn't be contacted: D-BUS error: 
Connection is closed
GConf Error: Configuration server couldn't be contacted: D-BUS error: 
Connection is closed
GConf Error: Configuration server couldn't be contacted: D-BUS error: 
Connection is closed

(compiz:546): Gdk-WARNING **: The application 'compiz' lost its connection to 
the display :0;
most likely the X server was shut down or you killed/destroyed
the application.

I cannot run unity --reset because of bug #778470

This seems to be related to the latest unity or compiz update, as it
happened on the first login after the update.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.16.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
CompizPlugins:
 (gconftool-2:6172): GConf-WARNING **: Client failed to connect to the D-BUS 
daemon:
 Failed to connect to socket /tmp/dbus-CDDpELkIiG: Connection refused
 Failed to get value for 
`/apps/compiz-1/general/screen0/options/active_plugins': No D-BUS daemon running
Date: Fri Sep 16 08:57:45 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-08-09 (37 days ago)

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


** Tags: amd64 apport-bug oneiric running-unity

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https://bugs.launchpad.net/bugs/851864

Title:
  Unity shell crashes on login

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