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Hi I am a newbie to ubuntu.

Installed 12.04 LTS on an Intel NUC and everything is running fine. Can ssh in from my macbook.

However I also would like to remotely run the desktop so I installed Quartz on my macbook and connected using ssh -X username@ubuntubox and then issue the command gnome-session --session=ubuntu-2d

it then shows my menu bar that I normally see at the top with the mail icon, sound, clock and settings at the right. But my desktop is not showing. This is the output I get from Xterm:

GNOME_KEYRING_CONTROL=/tmp/keyring-m4A7jF
SSH_AUTH_SOCK=/tmp/keyring-m4A7jF/ssh
GNOME_KEYRING_PID=3409
GNOME_KEYRING_CONTROL=/tmp/keyring-m4A7jF
SSH_AUTH_SOCK=/tmp/keyring-m4A7jF/ssh
GNOME_KEYRING_CONTROL=/tmp/keyring-m4A7jF
SSH_AUTH_SOCK=/tmp/keyring-m4A7jF/ssh
GNOME_KEYRING_CONTROL=/tmp/keyring-m4A7jF
SSH_AUTH_SOCK=/tmp/keyring-m4A7jF/ssh
GPG_AGENT_INFO=/tmp/keyring-m4A7jF/gpg:0:1
Xlib:  extension "DPMS" missing on display "localhost:10.0".

(gnome-settings-daemon:3408): power-plugin-WARNING **: Failed set DPMS mode: Display is not DPMS capable
[1397673619,000,xklavier.c:xkl_engine_start_listen/]    The backend does not require manual layout management - but it is provided by the application
Window manager warning: Screen 0 on display "localhost:10.0" already has a window manager

(gnome-settings-daemon:3408): keyboard-plugin-WARNING **: Failed to set the keyboard layouts: GDBus.Error:org.freedesktop.Accounts.Error.PermissionDenied: Not authorized
Window manager warning: Screen 0 on display "localhost:10.0" already has a window manager

** (gnome-settings-daemon:3408): WARNING **: Failed to connect context: Connection refused

(gnome-settings-daemon:3408): common-plugin-WARNING **: Key 0x70 (keycodes:  43)  with state 0x4000000 (resolved to 0x0)  has no usable modifiers (usable modifiers are 0x140000fd)

(gnome-settings-daemon:3408): clipboard-plugin-WARNING **: Clipboard manager is already running.
unity-2d-panel: [DEBUG] Scanning panel plugin directory "/usr/lib/unity-2d/plugins/panel" 
unity-2d-panel: [DEBUG] Loading panel plugin: "/usr/lib/unity-2d/plugins/panel/libpanelplugin-appindicator.so" 
unity-2d-panel: [DEBUG] Loading panel plugin: "/usr/lib/unity-2d/plugins/panel/libpanelplugin-appname.so" 
unity-2d-panel: [DEBUG] Loading panel plugin: "/usr/lib/unity-2d/plugins/panel/libpanelplugin-indicator.so" 
unity-2d-panel: [DEBUG] Loading panel plugin: "/usr/lib/unity-2d/plugins/panel/libpanelplugin-legacytray.so" 
unity-2d-panel: [DEBUG] Loading panel plugin: "/usr/lib/unity-2d/plugins/panel/libpanelplugin-separator.so" 
unity-2d-shell: [DEBUG] bool KeyMonitor::registerEvents(): Could not open device:  Virtual core pointer 
unity-2d-panel: [DEBUG] Configured plugins list is: ("appname", "!legacytray", "indicator") 
unity-2d-shell: [DEBUG] bool KeyMonitor::registerEvents(): Could not open device:  Virtual core keyboard 
unity-2d-shell: [DEBUG] static void WindowImageProvider::activateComposite(): Server doesn't support the Composite extension. 

(bluetooth-applet:3572): Bluetooth-WARNING **: Could not open RFKILL control device, please verify your installation

** (nm-applet:3569): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 2 matched rules; type="method_call", sender=":1.33" (uid=1000 pid=3569 comm="nm-applet ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=1182 comm="NetworkManager ")
Initializing nautilus-gdu extension
** Message: applet now removed from the notification area
** Message: using fallback from indicator to GtkStatusIcon
XInput version 2.3 found
unity-2d-shell: [WARNING] libindicator: Desktop file '/usr/share/applications/google-chrome.desktop' is using a deprecated format for its actions that will be dropped soon.
unity-2d-shell: [WARNING] libindicator: Desktop file '/usr/share/applications/libreoffice-writer.desktop' is using a deprecated format for its actions that will be dropped soon.
unity-2d-shell: [WARNING] libindicator: Desktop file '/usr/share/applications/libreoffice-calc.desktop' is using a deprecated format for its actions that will be dropped soon.
unity-2d-shell: [WARNING] libindicator: Desktop file '/usr/share/applications/libreoffice-impress.desktop' is using a deprecated format for its actions that will be dropped soon.
unity-2d-panel: [DEBUG] bool KeyMonitor::registerEvents(): Could not open device:  Virtual core pointer 
unity-2d-panel: [DEBUG] bool KeyMonitor::registerEvents(): Could not open device:  Virtual core keyboard 
unity-2d-panel: [WARNING] X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 18 (X_ChangeProperty)
  Resource id:  0x0
unity-2d-panel: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Alt+F10" 
** Message: moving back from GtkStatusIcon to indicator

** (gnome-settings-daemon:3408): WARNING **: Failed to connect context: Connection refused
Xlib:  extension "DPMS" missing on display "localhost:10.0".

(gnome-settings-daemon:3408): color-plugin-WARNING **: failed to get edid: unable to get EDID for output

(gnome-settings-daemon:3408): color-plugin-WARNING **: failed to create device: GDBus.Error:org.freedesktop.ColorManager.Failed: failed to obtain org.freedesktop.color-manager.create-device auth

(gnome-settings-daemon:3408): color-plugin-WARNING **: GDBus.Error:org.freedesktop.ColorManager.Failed: failed to obtain org.freedesktop.color-manager.create-profile auth

(gnome-settings-daemon:3408): color-plugin-WARNING **: GDBus.Error:org.freedesktop.ColorManager.Failed: failed to obtain org.freedesktop.color-manager.create-profile auth

(gnome-settings-daemon:3408): color-plugin-WARNING **: GDBus.Error:org.freedesktop.ColorManager.Failed: failed to obtain org.freedesktop.color-manager.create-profile auth
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+S" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+T" 

** (nautilus:3571): WARNING **: Can not get _NET_WORKAREA

** (nautilus:3571): WARNING **: Can not determine workarea, guessing at layout
[3580:3661:0416/204028:ERROR:download.cc(109)] PostClientToServerMessage() failed during GetUpdates
Connection failure: Connection refused
pa_context_connect() failed: Connection refused

unity-2d-shell: [WARNING] void QSortFilterProxyModelQML::setSourceModelQObject(QObject*): received a sourceModel that does not notify of changes of its roleNames 
unity-2d-shell: [WARNING] file:///usr/share/unity-2d/shell/hud/Hud.qml:145: TypeError: Result of expression 'shellManager.hudShell' [null] is not an object.
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Alt+F1" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Alt+F2" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+0" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+0" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+1" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+1" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+2" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+2" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+3" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+3" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+4" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+4" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+5" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+5" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+6" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+6" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+7" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+7" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+8" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+8" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+9" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+Shift+9" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+ퟀ" 
unity-2d-shell: [WARNING] libindicator: Unable to load keyfile from file '': No such file or directory
unity-2d-shell: [CRITICAL] Wnck: wnck_window_get_geometry: assertion `WNCK_IS_WINDOW (window)' failed
unity-2d-shell: [CRITICAL] Wnck: wnck_window_set_icon_geometry: assertion `WNCK_IS_WINDOW (window)' failed
unity-2d-shell: [WARNING] GLib-GObject: invalid (NULL) pointer instance
unity-2d-shell: [CRITICAL] GLib-GObject: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
unity-2d-shell: [CRITICAL] GLib-GObject: g_object_weak_ref: assertion `G_IS_OBJECT (object)' failed
unity-2d-shell: [WARNING] GLib-GObject: invalid (NULL) pointer instance
unity-2d-shell: [CRITICAL] GLib-GObject: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
unity-2d-shell: [CRITICAL] Wnck: wnck_window_get_geometry: assertion `WNCK_IS_WINDOW (window)' failed
unity-2d-shell: [CRITICAL] Wnck: wnck_window_set_icon_geometry: assertion `WNCK_IS_WINDOW (window)' failed
unity-2d-shell: [WARNING] void ApplicationsList::remoteEntryUpdated(const QString&, const QString&, const QString&, const QMap<QString, QVariant>&): Application sent an update but we don't seem to have it in the launcher: "application://nautilus.desktop" 
unity-2d-shell: [WARNING] void ApplicationsList::remoteEntryUpdated(const QString&, const QString&, const QString&, const QMap<QString, QVariant>&): Application sent an update but we don't seem to have it in the launcher: "application://nautilus.desktop" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+A" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+F" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+M" 
unity-2d-shell: [DEBUG] virtual void Hotkey::connectNotify(const char*): Grabbing hotkey "Meta+V" 
WARN  2014-04-16 20:40:32 unity.glib.dbusproxy GLibDBusProxy.cpp:283 Calling method "InfoRequest" on object path: "/net/launchpad/lens/video" failed: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `com.canonical.Unity.Lens' on object at path /net/launchpad/lens/video
WARN  2014-04-16 20:40:32 unity.glib.dbusproxy GLibDBusProxy.cpp:283 Calling method "SetViewType" on object path: "/net/launchpad/lens/video" failed: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `com.canonical.Unity.Lens' on object at path /net/launchpad/lens/video
unity-2d-shell: [CRITICAL] dee: clone_leader: assertion `dee_model_get_n_rows (DEE_MODEL (self)) == 0' failed
unity-2d-shell: [WARNING] void ApplicationsList::remoteEntryUpdated(const QString&, const QString&, const QString&, const QMap<QString, QVariant>&): Application sent an update but we don't seem to have it in the launcher: "application://empathy.desktop" 
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