I've upgrade gnome to 3.0 and gdm3 (v. 3.0.4-3) connects and disconnects any seconds after. I had to dowgrade to gdm 2.20 but, i can't configure gnome 3 because gnome and gnome-accessibility packages had to be removed.

Linux salon 3.0.4.110830-gdn #1 SMP Tue Aug 30 22:33:16 CEST 2011 i686 GNU/Linux

ii  apt-watch-gnome                                              0.3.3-1                            Applet that monitors apt sources for upgrades (GNOME applet)
rc  bluez-gnome                                                  1.8-1                              Bluetooth utilities for GNOME
ii  camorama                                                     0.19-2.2                           gnome utility to view and save images from a webcam
ii  dia-gnome                                                    0.97.1-9+b1                        Diagram editor (GNOME version)
ii  doc-gnome-hig                                                2.0-3                              GNOME Human Interface Guidelines
ii  freepops-updater-gnome                                       0.2.9-5                            GNOME interface for the freepops updater engine
ii  gir1.2-gnomebluetooth-1.0                                    3.2.0-2                            Introspection data for GnomeBluetooth
ii  gir1.2-gnomedesktop-3.0                                      3.0.2-2                            Introspection data for GnomeDesktop
ii  gnome-about                                                  2.30.2-2                           The GNOME about box
ii  gnome-accessibility-themes                                   2.30.2-1                           accessibility themes for the GNOME desktop
ii  gnome-alsamixer                                              0.9.7~cvs.20060916.ds.1-2          ALSA sound mixer for GNOME
ii  gnome-api-docs                                               1:3.0+2                            API reference documentation for the GNOME libraries
ii  gnome-app-install                                            2.0.7debian7                       dummy upgrade package for gnome-app-install -> software-center
ii  gnome-applets                                                3.2.0-2                            Various applets for the GNOME panel - binary files
ii  gnome-applets-data                                           3.2.0-2                            Various applets for the GNOME panel - data files
ii  gnome-audio                                                  2.22.2-1                           Audio files for GNOME
ii  gnome-backgrounds                                            3.2.0-1                            Set of backgrounds packaged with the GNOME desktop
rc  gnome-bin                                                    1.4.2-37+b1                        Miscellaneous binaries used by GNOME
ii  gnome-bluetooth                                              3.2.0-2                            GNOME Bluetooth tools
ii  gnome-breakout                                               0.5.3-2                            Clone of the classic game Breakout, written for GNOME
ii  gnome-cards-data                                             1:3.0.2-2                          data files for the GNOME card games
ii  gnome-chess                                                  0.4.0-3                            chess client for the GNOME desktop environment
ii  gnome-codec-install                                          0.4.7+nmu1                         GStreamer codec installer
ii  gnome-color-chooser                                          0.2.5-1                            GTK+/GNOME desktop appearance customization tool
ii  gnome-color-manager                                          2.32.0-2                           Color management integration for the GNOME desktop environment
ii  gnome-colors-common                                          5.5.1-1                            common icons for all GNOME-Colors icon themes
ii  gnome-commander                                              1.2.8.14-1                         nice and fast file manager for the GNOME desktop
ii  gnome-commander-data                                         1.2.8.14-1                         Data files for GNOME Commander
ii  gnome-common                                                 2.34.0-1                           common scripts and macros to develop with GNOME
rc  gnome-control-center                                         1:3.0.2-3                          utilities to configure the GNOME desktop
rc  gnome-control-center-data                                    1:3.0.2-3                          configuration applets for GNOME - data files
ii  gnome-control-center-dev                                     1:3.0.2-3                          utilities to configure the GNOME desktop
ii  gnome-core-devel                                             1:3.0+2                            The GNOME Desktop Environment -- development components
rc  gnome-cups-manager                                           0.31-3                             CUPS printer admin tool for GNOME
ii  gnome-desktop-data                                           2.30.2-2                           Common files for GNOME desktop apps
ii  gnome-desktop3-data                                          3.0.2-2                            Common files for GNOME desktop apps
ii  gnome-devel-docs                                             3.2.0-1                            GNOME developer documentation
ii  gnome-device-manager                                         0.2-3                              GNOME device manager based on HAL
ii  gnome-dictionary                                             3.0.1-5                            GNOME dictionary application
ii  gnome-disk-utility                                           3.0.2-2                            manage and configure disk drives and media
ii  gnome-do                                                     0.8.5-1                            Quickly perform actions on your desktop
ii  gnome-do-plugins                                             0.8.4-2                            Extra functionality for GNOME Do
ii  gnome-doc-utils                                              0.20.6-1                           collection of documentation utilities for the GNOME project
ii  gnome-dust-icon-theme                                        5.5.1-1                            chocolate variation of the GNOME-Colors icon theme
ii  gnome-dvb-client                                             1:0.1.23-1+b1                      client for gnome-dvb-daemon
ii  gnome-dvb-daemon                                             1:0.1.23-1+b1                      daemon to setup your DVB devices, record and watch TV shows and browse EPG
ii  gnome-extra-icons                                            1.1-2                              Optional GNOME icons
ii  gnome-font-viewer                                            3.0.1-5                            font viewer for GNOME
ii  gnome-games                                                  1:3.0.2-2                          games for the GNOME desktop
ii  gnome-games-data                                             1:3.0.2-2                          data files for the GNOME games
ii  gnome-games-extra-data                                       3.0.0-1                            games for the GNOME desktop (extra artwork)
ii  gnome-gpg                                                    0.6.0-1                            GPG passphrase agent based on GNOME Keyring
ii  gnome-icon-theme                                             3.2.0-1                            GNOME Desktop icon theme
ii  gnome-icon-theme-extras                                      3.0.0-3                            GNOME Desktop icon theme (additional icons)
ii  gnome-icon-theme-symbolic                                    3.2.0-2                            GNOME Desktop icon theme (symbolic icons)
ii  gnome-js-common                                              0.1.2-1                            Common modules for GNOME JavaScript interpreters
ii  gnome-keyring                                                3.0.3-2                            GNOME keyring services (daemon and tools)
ii  gnome-keyring-manager                                        2.20.0-1                           keyring management program for the GNOME desktop
rc  gnome-libs-data                                              1.4.2-37                           Data for GNOME libraries
ii  gnome-mag                                                    1:0.16.3-1                         a screen magnifier for the GNOME desktop
ii  gnome-main-menu                                              0.9.16-1                           GNOME start menu applet
ii  gnome-media                                                  2.91.2-3                           GNOME media utilities
ii  gnome-media-common                                           2.30.0-1                           GNOME media utilities - common files
ii  gnome-media-profiles                                         3.0.0-1                            GNOME Media Profiles library
ii  gnome-menus                                                  3.0.1-2                            GNOME implementation of the freedesktop menu specification
ii  gnome-mime-data                                              2.18.0-1                           base MIME and Application database for GNOME.
rc  gnome-mount                                                  0.8-2                              wrapper for (un)mounting and ejecting storage devices
ii  gnome-netstatus-applet                                       2.28.1-1                           Network status applet for GNOME
ii  gnome-nettool                                                3.0.0-2                            network information tool for GNOME
rc  gnome-network-admin                                          2.22.1-4                           GNOME Network Administration Tool
ii  gnome-office                                                 1:2.30+11                          The GNOME Office suite
ii  gnome-orca                                                   2.30.2-2                           Scriptable screen reader
ii  gnome-packagekit                                             3.0.3-2                            Graphical distribution neutral software management tools
ii  gnome-packagekit-data                                        3.0.3-2                            Data files for graphical distribution neutral software management tools
ii  gnome-panel                                                  3.0.2-1                            launcher and docking facility for GNOME
ii  gnome-panel-control                                          3.5.0-1                            command line utility to invoke GNOME panel run dialog/menu
ii  gnome-panel-data                                             3.0.2-1                            common files for the GNOME Panel
rc  gnome-pilot                                                  2.0.15-2.4                         A GNOME applet for management of your Palm PDA
ii  gnome-pkg-tools                                              0.19.1                             Tools for the Debian GNOME Packaging Team
ii  gnome-platform-devel                                         1:3.0+2                            GNOME development platform
ii  gnome-power-manager                                          3.0.2-2                            power management tool for the GNOME desktop
ii  gnome-randr-applet                                           0.4.1-1                            Simple gnome-panel front end to the xrandr extension
ii  gnome-rdp                                                    0.3.0.9-2                          remote desktop client for GNOME
ii  gnome-scan-common                                            0.6.2-1                            Scan library for GNOME - common files
ii  gnome-schedule                                               2.1.1-4                            GNOME scheduler for automatic tasks
ii  gnome-screensaver                                            3.0.1-1                            GNOME screen saver and locker
ii  gnome-screenshot                                             3.0.1-5                            screenshot application for GNOME
ii  gnome-search-tool                                            3.0.1-5                            GNOME tool to search files
ii  gnome-session                                                3.0.2-3                            GNOME Session Manager - GNOME 3 session
ii  gnome-session-bin                                            3.0.2-3                            GNOME Session Manager - Minimal runtime
ii  gnome-session-canberra                                       0.28-2                             GNOME session log in and log out sound events
ii  gnome-session-common                                         3.0.2-3                            GNOME Session Manager - common files
ii  gnome-session-fallback                                       3.0.2-3                            GNOME Session Manager - GNOME fallback session
ii  gnome-settings-daemon                                        3.0.3-3                            daemon handling the GNOME session settings
ii  gnome-settings-daemon-dev                                    3.0.3-3                            Headers for building applications communicating with gnome-settings-daemon
ii  gnome-shell                                                  3.0.2-5                            graphical shell for the GNOME desktop
ii  gnome-spell                                                  1.0.7-1                            GNOME/Bonobo component for spell checking
ii  gnome-sudoku                                                 1:3.0.2-2                          Sudoku puzzle game for GNOME
ii  gnome-system-log                                             3.0.1-5                            system log viewer for GNOME
ii  gnome-system-monitor                                         3.2.0-1                            Process viewer and system resource monitor for GNOME
ii  gnome-system-tools                                           2.30.2-2                           Cross-platform configuration utilities for GNOME
ii  gnome-terminal                                               3.0.1-1                            GNOME terminal emulator application
ii  gnome-terminal-data                                          3.0.1-1                            Data files for the GNOME terminal emulator
ii  gnome-themes                                                 2.30.2-1                           official themes for the GNOME desktop
ii  gnome-themes-extras                                          2.22.0-3                           extra themes for the GNOME desktop
ii  gnome-themes-more                                            0.9.0.deb0.8                       various themes for the GNOME desktop
ii  gnome-themes-standard                                        3.0.2-1                            Standard gnome themes
ii  gnome-user-guide                                             3.2.0.1-2                          GNOME user's guide
ii  gnome-user-share                                             3.0.0-3                            User level public file sharing via WebDAV or ObexFTP
ii  gnome-utils-common                                           3.0.1-5                            data files for the GNOME utilities
ii  gnome-vfs-obexftp                                            0.4-1+b1                           GNOME VFS module for OBEX FTP
ii  gnome-video-effects                                          0.3.0-4                            GNOME Video Effects
ii  gnome-video-effects-dev                                      0.3.0-4                            Development files for gnome-video-effects
ii  gnome-video-effects-frei0r                                   0.3.0-4                            GNOME Video Effects - frei0r plugins
ii  gnome-volume-manager                                         2.24.1-4                           GNOME daemon to auto-mount and manage media devices
ii  gnome-wine-icon-theme                                        5.5.1-1                            red variation of the GNOME-Colors icon theme
ii  gnome-wise-icon-theme                                        5.5.1-1                            green variation of the GNOME-Colors icon theme
ii  guile-gnome2-glib                                            2.16.1-6.1                         Guile bindings for GLib
ii  guile-gnome2-gnome-ui                                        2.16.1-6.1                         Guile bindings for libgnome
ii  guile-gnome2-gtk                                             2.16.1-6.1                         Guile bindings for GTK+, libglade, Pango and ATK
ii  libgail-gnome-dev                                            1.20.3-1                           Development files of libgail-gnome
ii  libgail-gnome-module                                         1.20.3-1                           GNOME Accessibility Implementation Module for GnomeUI/BonoboUI
rc  libgdl-gnome-1-0                                             0.7.11-1                           GNOME DevTool libraries (GNOME)
ii  libgnome-bluetooth-dev                                       3.2.0-2                            GNOME Bluetooth tools - support library development files
rc  libgnome-bluetooth2                                          2.27.5-1                           GNOME Bluetooth tools - support library
ii  libgnome-bluetooth7                                          2.30.0-3                           GNOME Bluetooth tools - support library
ii  libgnome-bluetooth8                                          3.2.0-2                            GNOME Bluetooth tools - support library
ii  libgnome-control-center1                                     1:3.0.2-3                          utilities to configure the GNOME desktop
rc  libgnome-desktop-2                                           2.22.3-2                           Utility library for loading .desktop files - runtime files
ii  libgnome-desktop-2-11                                        2.28.2-1                           Utility library for loading .desktop files - runtime files
ii  libgnome-desktop-2-17                                        2.30.2-2                           Utility library for loading .desktop files - runtime files
ii  libgnome-desktop-2-7                                         2.24.3-1                           Utility library for loading .desktop files - runtime files
ii  libgnome-desktop-3-0                                         3.0.2-2                            Utility library for loading .desktop files - runtime files
ii  libgnome-desktop-3-dev                                       3.0.2-2                            Utility library for loading .desktop files - development files
ii  libgnome-desktop-dev                                         2.30.2-2                           Utility library for loading .desktop files - development files
ii  libgnome-device-manager0                                     0.2-3                              GNOME device manager based on HAL - libraries
ii  libgnome-keyring-dev                                         3.2.0-2                            Development files for GNOME keyring service
ii  libgnome-keyring0                                            3.2.0-2                            GNOME keyring services library
ii  libgnome-keyring1.0-cil                                      1.0.0-3                            CLI library to access the GNOME Keyring daemon
ii  libgnome-mag2                                                1:0.16.3-1                         screen magnification library for the GNOME desktop (shared library)
ii  libgnome-media-profiles-3.0-0                                3.0.0-1                            GNOME Media Profiles library
ii  libgnome-media0                                              2.30.0-1                           runtime libraries for the GNOME media utilities
ii  libgnome-menu-dev                                            3.0.1-2                            GNOME implementation of the freedesktop menu specification
ii  libgnome-menu2                                               3.0.1-2                            GNOME implementation of the freedesktop menu specification
rc  libgnome-pilot2                                              2.0.15-2.4                         Support libraries for gnome-pilot
ii  libgnome-speech-dev                                          1:0.4.25-4                         GNOME text-to-speech library (development headers)
rc  libgnome-speech3                                             1:0.3.10-1.2                       GNOME text-to-speech library
ii  libgnome-speech7                                             1:0.4.25-4                         GNOME text-to-speech library
ii  libgnome-vfs2.0-cil                                          2.24.2-1                           CLI binding for GnomeVFS 2.24
ii  libgnome-vfsmm-2.6-1c2a                                      2.26.0-1                           C++ wrappers for GnomeVFS (shared library)
ii  libgnome-vfsmm-2.6-dev                                       2.26.0-1                           C++ wrappers for GnomeVFS (development files)
ii  libgnome-window-settings1                                    1:2.30.1-3                         Utility library for getting window manager settings
ii  libgnome2-0                                                  2.32.1-2                           The GNOME library - runtime files
ii  libgnome2-canvas-perl                                        1.002-2+b1                         Perl interface to the GNOME canvas library
ii  libgnome2-common                                             2.32.1-2                           The GNOME library - common files
ii  libgnome2-dev                                                2.32.1-2                           The GNOME library - development files
ii  libgnome2-perl                                               1.042-2+b1                         Perl interface to the GNOME libraries
ii  libgnome2-vfs-perl                                           1.081-3                            Perl interface to the 2.x series of the GNOME VFS library
ii  libgnome2.24-cil                                             2.24.2-1                           CLI binding for GNOME 2.24
rc  libgnome32                                                   1.4.2-37+b1                        The GNOME libraries
rc  libgnomebt0                                                  0.9.1-1                            GNOME Bluetooth library
ii  libgnomecanvas2-0                                            2.30.3-1                           powerful object-oriented display engine - runtime files
ii  libgnomecanvas2-common                                       2.30.3-1                           powerful object-oriented display engine - common files
ii  libgnomecanvas2-dev                                          2.30.3-1                           powerful object-oriented display engine - development files
ii  libgnomecanvasmm-2.6-1c2a                                    2.26.0-1                           C++ wrappers for libgnomecanvas2 (shared library)
ii  libgnomecanvasmm-2.6-dev                                     2.26.0-1                           C++ wrappers for libgnomecanvas2 (development files)
ii  libgnomecups1.0-1                                            0.2.3-3+b1                         GNOME library for CUPS interaction
rc  libgnomecupsui1.0-1c2a                                       0.31-3                             UI extensions to libgnomecups
ii  libgnomedb3-4                                                3.0.0-5                            Database UI widget library for GNOME2
ii  libgnomedb3-bin                                              3.0.0-5                            Database UI widget library for GNOME2 -- binary files
ii  libgnomedb3-common                                           3.0.0-5                            Database UI widget library for GNOME2 -- common files
ii  libgnomedesktop2.20-cil                                      2.26.0-6                           CLI binding for GNOME Desktop 2.24
ii  libgnomekbd-common                                           3.2.0-1                            GNOME library to manage keyboard configuration - common files
ii  libgnomekbd-dev                                              3.2.0-1                            GNOME library to manage keyboard configuration - development files
ii  libgnomekbd2                                                 2.22.0-2                           GNOME library to manage keyboard configuration - shared library
rc  libgnomekbd3                                                 2.26.0-1                           GNOME library to manage keyboard configuration - shared library
ii  libgnomekbd4                                                 2.30.2-2                           GNOME library to manage keyboard configuration - shared library
ii  libgnomekbd7                                                 3.2.0-1                            GNOME library to manage keyboard configuration - shared library
ii  libgnomekbdui2                                               2.22.0-2                           User interface library for libgnomekbd - shared library
ii  libgnomemm-2.6-1c2                                           2.30.0-1                           C++ wrappers for libgnome (shared library)
ii  libgnomemm-2.6-dev                                           2.30.0-1                           C++ wrappers for libgnome (development files)
ii  libgnomeprint2.2-0                                           2.18.8-1                           GNOME print architecture - runtime files
ii  libgnomeprint2.2-data                                        2.18.8-1                           GNOME print architecture - data files
ii  libgnomeprintui2.2-0                                         2.18.6-1                           GNOME print architecture User Interface - runtime files
ii  libgnomeprintui2.2-common                                    2.18.6-1                           GNOME print architecture User Interface - common files
ii  libgnomescan0                                                0.6.2-1                            Scan library for GNOME - runtime
rc  libgnomesupport0                                             1.4.2-37+b1                        The GNOME libraries (Support libraries)
ii  libgnomeui-0                                                 2.24.5-2                           GNOME user interface library - runtime files
ii  libgnomeui-common                                            2.24.5-2                           GNOME user interface library - common files
ii  libgnomeui-dev                                               2.24.5-2                           GNOME user interface library - development files
rc  libgnomeui32                                                 1.4.2-37+b1                        The GNOME libraries (User Interface)
ii  libgnomeuimm-2.6-1c2a                                        2.28.0-1                           C++ wrappers for libgnomeui (shared library)
ii  libgnomeuimm-2.6-dev                                         2.28.0-1                           C++ wrappers for libgnomeui (development files)
ii  libgnomevfs2-0                                               1:2.24.4-1                         GNOME Virtual File System (runtime libraries)
ii  libgnomevfs2-bin                                             1:2.24.4-1                         GNOME Virtual File System (support binaries)
ii  libgnomevfs2-common                                          1:2.24.4-1                         GNOME Virtual File System (common files)
ii  libgnomevfs2-dev                                             1:2.24.4-1                         GNOME Virtual File System library (development files)
ii  libgnomevfs2-extra                                           1:2.24.4-1                         GNOME Virtual File System (extra modules)
ii  libgsf-gnome-1-114                                           1.14.21-2                          Structured File Library - runtime version for GNOME
ii  libntfs-gnomevfs                                             2.0.0-1+b1                         NTFS GNOME virtual filesystem module
ii  libopenrawgnome-dev                                          0.0.8-3+b1                         GNOME integration for libopenraw - development files
ii  libopenrawgnome1                                             0.0.8-3+b1                         free implementation for RAW decoding (GNOME integration)
ii  libpam-gnome-keyring                                         3.0.3-2                            PAM module to unlock the GNOME keyring upon login
ii  libpolkit-gnome0                                             0.9-1                              PolicyKit-gnome library
ii  libreoffice-gnome                                            1:3.4.3-4                          office productivity suite -- GNOME integration
ii  libsoup-gnome2.4-1                                           2.36.0-1                           HTTP library implementation in C -- GNOME support library
ii  libsoup-gnome2.4-dev                                         2.36.0-1                           HTTP library implementation in C -- GNOME support development files
ii  libxine1-gnome                                               1:1.1.19-3.3                       GNOME-related plugins for libxine1
ii  libxine2-gnome                                               1.1.90hg+20080814+4542a8b61c15-1   GNOME-related plugins for libxine2
ii  monodoc-gnome-keyring-manual                                 1.0.0-3                            CLI library to access the GNOME Keyring daemon - manual
ii  network-manager-gnome                                        0.9.0-3                            network management framework (GNOME frontend)
ii  policykit-1-gnome                                            0.102-2                            GNOME authentication agent for PolicyKit-1
ii  policykit-gnome                                              0.9-1                              GNOME dialogs for PolicyKit
ii  python-gnome2                                                2.28.1-3                           Python bindings for the GNOME desktop environment
ii  python-gnome2-desktop-dev                                    2.32.0-4                           Python bindings for the GNOME desktop environment
ii  python-gnome2-dev                                            2.28.1-3                           Python bindings for the GNOME desktop environment - development files
ii  python-gnome2-doc                                            2.28.1-3                           Python bindings for the GNOME desktop environment
ii  python-gnomeapplet                                           2.32.0-3                           Python bindings for the GNOME panel applet library
ii  python-gnomedesktop                                          2.32.0-4                           Python bindings for the GNOME desktop library
ii  python-gnomekeyring                                          2.32.0-4                           Python bindings for the GNOME keyring library
ii  routeplanner-gnome                                           0.19                               A highway trip planner (GNOME interface)
rc  swfdec-gnome                                                 2.28.0-1                           Tools to play SWF files (Macromedia Flash) on GNOME
ii  update-manager-gnome                                         0.200.5-2                          GNOME application that manages software updates
ii  vim-gnome                                                    2:7.3.333-1                        Vi IMproved - enhanced vi editor - with GNOME2 GUI
ii  xchat-gnome                                                  1:0.30.0~git20110821.e2a400-0.2+b1 simple and featureful IRC client for GNOME
ii  xchat-gnome-common                                           1:0.30.0~git20110821.e2a400-0.2    data files for XChat-GNOME
rc  xulrunner-1.9-gnome-support                                  1.9.0.16-1                         Support for GNOME in xulrunner applications