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[m0sia <907802@xxxxxxxxxxxxxxxxxx>]

tried debugging gnome-session. It seems the problem is assertion in GLib-GIO, not the gnome-session itself:
GLib-GIO:ERROR:/build/buildd/glib2.0-2.30.0/./gio/gsettingsschema.c:125:ensure_schema_lists: assertion failed: (list != NULL)

(gdb) r
Starting program: /usr/bin/gnome-session 
[Thread debugging using libthread_db enabled]
[New Thread 0x7fffed9d2700 (LWP 25084)]
[New Thread 0x7fffed1d1700 (LWP 25086)]
[New Thread 0x7fffec9d0700 (LWP 25087)]
**
GLib-GIO:ERROR:/build/buildd/glib2.0-2.30.0/./gio/gsettingsschema.c:125:ensure_schema_lists: assertion failed: (list != NULL)

Program received signal SIGABRT, Aborted.
0x00007ffff47d63a5 in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64	../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
	in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) bt
#0  0x00007ffff47d63a5 in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff47d9b0b in __GI_abort () at abort.c:92
#2  0x00007ffff4ba74ad in g_assertion_message () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4ba79d2 in g_assertion_message_expr () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ffff534e17d in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007ffff534e279 in g_settings_list_schemas () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#6  0x000000000040e3f7 in setup_gsettings_condition_monitor (key=<optimized out>, app=0x713010) at gsm-autostart-app.c:352
#7  setup_condition_monitor (app=0x713010) at gsm-autostart-app.c:547
#8  load_desktop_file (app=0x713010) at gsm-autostart-app.c:660
#9  gsm_autostart_app_constructor (type=<optimized out>, n_construct_properties=<optimized out>, construct_properties=<optimized out>) at gsm-autostart-app.c:1406
#10 0x00007ffff5077e94 in g_object_newv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff5078d66 in g_object_new_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff5079074 in g_object_new () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x000000000040ef5d in gsm_autostart_app_new (desktop_file=0x70b3d0 "/usr/share/gnome/autostart/libcanberra-login-sound.desktop") at gsm-autostart-app.c:1464
#14 0x0000000000420058 in add_autostart_app_internal (manager=0x6f30a0, path=0x70b3d0 "/usr/share/gnome/autostart/libcanberra-login-sound.desktop", provides=0x0, is_required=0) at gsm-manager.c:4003
#15 0x0000000000423260 in gsm_manager_add_autostart_apps_from_dir (manager=0x6f30a0, path=0x7066b0 "/usr/share/gnome/autostart") at gsm-manager.c:4111
#16 0x0000000000423f84 in load_standard_apps (keyfile=0x6f04f0, manager=0x6f30a0) at gsm-session-fill.c:238
#17 gsm_session_fill (manager=0x6f30a0, override_autostart_dirs=<optimized out>, session=<optimized out>) at gsm-session-fill.c:499
#18 0x000000000040b6ff in main (argc=1, argv=0x7fffffffe328) at main.c:357

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https://bugs.launchpad.net/bugs/907802

Title:
  gnome-session crashes at startup, unable to login

Status in “gnome-session” package in Ubuntu:
  New

Bug description:
  Description:	Ubuntu 11.10
  Release:	11.10

  $ apt-cache policy libglib2.0-0
  libglib2.0-0:
    Installed: 2.30.0-0ubuntu4
    Candidate: 2.30.0-0ubuntu4
    Version table:
   *** 2.30.0-0ubuntu4 0
          500 http://archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
          100 /var/lib/dpkg/status

  gnome-session:
    Installed: 3.2.1-0ubuntu1.1
    Candidate: 3.2.1-0ubuntu1.1
    Version table:
   *** 3.2.1-0ubuntu1.1 0
          500 http://archive.ubuntu.com/ubuntu/ oneiric-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       3.2.0-0ubuntu3 0
          500 http://archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages

  
  When I am trying to login i have the following error:

  
  GLib-GIO:ERROR:/build/buildd/glib2.0-2.30.0/./gio/gsettingsschema.c:125:ensure_schema_lists: assertion failed: (list != NULL)
  gnome-session[15182]: ******************* START ********************************
  gnome-session[15182]: Frame 0: /usr/bin/gnome-session() [0x419d07]
  gnome-session[15182]: Frame 1: /usr/bin/gnome-session() [0x41a0ea]
  gnome-session[15182]: Frame 2: /lib/x86_64-linux-gnu/libpthread.so.0(+0x10060) [0x7fe1f9b56060]
  gnome-session[15182]: Frame 3: /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7fe1f88ef3a5]
  gnome-session[15182]: Frame 4: /lib/x86_64-linux-gnu/libc.so.6(abort+0x17b) [0x7fe1f88f2b0b]
  gnome-session[15182]: Frame 5: /lib/x86_64-linux-gnu/libglib-2.0.so.0(g_assertion_message+0x12d) [0x7fe1f8cc04ad]
  gnome-session[15182]: Frame 6: /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x689d2) [0x7fe1f8cc09d2]
  gnome-session[15182]: Frame 7: /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0(+0x9a17d) [0x7fe1f946717d]
  gnome-session[15182]: Frame 8: /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0(g_settings_list_schemas+0x9) [0x7fe1f9467279]
  gnome-session[15182]: Frame 9: /usr/bin/gnome-session() [0x40e3f7]
  gnome-session[15182]: Frame 10: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_object_newv+0x294) [0x7fe1f9190e94]
  gnome-session[15182]: Frame 11: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_object_new_valist+0x1d6) [0x7fe1f9191d66]
  gnome-session[15182]: Frame 12: /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_object_new+0xd4) [0x7fe1f9192074]
  gnome-session[15182]: Frame 13: /usr/bin/gnome-session() [0x40ef5d]
  gnome-session[15182]: Frame 14: /usr/bin/gnome-session() [0x420058]
  gnome-session[15182]: Frame 15: /usr/bin/gnome-session() [0x423260]
  gnome-session[15182]: Frame 16: /usr/bin/gnome-session() [0x423f84]
  gnome-session[15182]: Frame 17: /usr/bin/gnome-session() [0x40b6ff]
  gnome-session[15182]: Frame 18: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7fe1f88da30d]
  gnome-session[15182]: Frame 19: /usr/bin/gnome-session() [0x40b985]
  gnome-session[15182]: ******************* END **********************************

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-session 3.2.1-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
  Uname: Linux 3.0.0-14-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  Date: Thu Dec 22 21:08:30 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-session
  UpgradeStatus: No upgrade log present (probably fresh install)

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