It seems it is a constant problem. I faced with that, the symptom was:
after GRUB booting the big fat nothing happened, only a black screen
(sometimes with the Ubuntu logo). Absolutely no answer for the keyboard
tries (the F keys and so), I could only make a 'hardreset' (pushing the
ON button for 14 seconds). My laptop is a Dell Latitude 5401, and before
the problem I've changed the nVidia settings (nVidia GeForce MX150 card
from 'on demand' to 'Performance Mode'. The system rewrote the
xorg.config file to the nVidia settings, and this way - as I suspected -
this caused a window-handler system failure in Ubuntu. Nothing helped, I
tried a lot (key-combinations, Boot-Repair from USB, using Boot-Repair's
terminal, etc.), but at last I found the solution. I loaded Puppy linux,
and this way I managed to access and delete that config file from
/etc/X11 (xorg.config). After all, everything goes fine, but now I don't
have a xorg.config file in /etc/X11 folder (do I need that at all?).

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-session in Ubuntu.
https://bugs.launchpad.net/bugs/424511

Title:
  gnome-panel and window manager do not start on login

Status in gnome-session package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: gnome-session

  After upgrading from Jaunty to Karmic today, I can no longer log into Gnome 
desktop. All I can see is my wallpaper and (Gnome) mouse pointer. However, 
launching an xterm session and then executing:
  gnome-session & gnome-panel & compiz &
  brings me a fully functional desktop.

  ProblemType: Bug
  Architecture: amd64
  Date: Fri Sep  4 22:46:18 2009
  DistroRelease: Ubuntu 9.10
  NonfreeKernelModules: nvidia
  Package: gnome-session 2.27.91-0ubuntu1
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-9.29-generic
  SourcePackage: gnome-session
  Uname: Linux 2.6.31-9-generic x86_64

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