je ne connais pas du tout cette application mais je vois dans tes retours une drôle de chose : c'est normal qu'il "plante" car il n'est pas lancé en utilisateur : c'est l'un ou l'autre - il faut donc dé-valider en premier la version système
Le notifieur était déjà indiqué dans les Démarrage automatique d'application
J'ai relancé la commanse sudo /usr/bin/xfce4/notifyd/xfce4-notifyd et voici ce qaue me renvoie le terminal :
[bruno@bruno ~]$ sudo /usr/lib/xfce4/notifyd/xfce4-notifyd
[sudo] Mot de passe de bruno :
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.745: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GObject-WARNING **: 23:16:28.745: invalid (NULL) pointer instance
(xfce4-notifyd:6859): GLib-GObject-CRITICAL **: 23:16:28.745: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.745: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.745: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.745: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.745: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.745: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.745: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.745: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.745: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.745: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.745: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.745: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.745: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
(xfce4-notifyd:6859): GLib-CRITICAL **: 23:16:28.748: g_propagate_error: assertion 'src != NULL' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_proxy_call_sync_internal: assertion 'G_IS_DBUS_PROXY (proxy)' failed
Un autre démon de notification est en cours d’exécution, arrêt.
(xfce4-notifyd:6859): GLib-GIO-CRITICAL **: 23:16:28.748: g_dbus_interface_skeleton_has_connection: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
(xfce4-notifyd:6859): xfconf-CRITICAL **: 23:16:28.748: xfconf_init() must be called before attempting to use libxfconf!
(xfce4-notifyd:6859): GLib-GObject-WARNING **: 23:16:28.748: invalid (NULL) pointer instance
(xfce4-notifyd:6859): GLib-GObject-CRITICAL **: 23:16:28.748: g_signal_handler_disconnect: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Système : Manjaro XFCE LTS CPU : 6 x Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz Carte graphique : NVIDIA Corporation GP107 [GeForce GTX 1050] (rev a1) Cartes son : Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
Audio device: NVIDIA Corporation GP107GL High Definition Audio Controller (rev a1)