diff --git a/ui/opensnitch/config.py b/ui/opensnitch/config.py
index be96b8d3..a05345d9 100644
--- a/ui/opensnitch/config.py
+++ b/ui/opensnitch/config.py
@@ -8,6 +8,7 @@ class Config:
     HELP_RULES_URL = "https://github.com/evilsocket/opensnitch/wiki/Rules"
     HELP_SYS_RULES_URL = "https://github.com/evilsocket/opensnitch/wiki/System-rules"
     HELP_CONFIG_URL = "https://github.com/evilsocket/opensnitch/wiki/Configurations"
+    HELP_SYSTRAY_WARN = "https://github.com/evilsocket/opensnitch/wiki/Known-problems#opensnitch-icon-does-not-show-up-on-gnome-shell"
 
     OPERAND_PROCESS_ID = "process.id"
     OPERAND_PROCESS_PATH = "process.path"
@@ -101,6 +102,7 @@ class Config:
     DEFAULT_POPUP_ADVANCED_DSTPORT = "global/default_popup_advanced_dstport"
     DEFAULT_POPUP_ADVANCED_UID = "global/default_popup_advanced_uid"
     DEFAULT_SERVER_ADDR  = "global/server_address"
+    DEFAULT_HIDE_SYSTRAY_WARN  = "global/hide_systray_warning"
     DEFAULT_DB_TYPE_KEY  = "database/type"
     DEFAULT_DB_FILE_KEY  = "database/file"
     DEFAULT_DB_PURGE_OLDEST  = "database/purge_oldest"
diff --git a/ui/opensnitch/service.py b/ui/opensnitch/service.py
index e4d0ec7b..db3dbab6 100644
--- a/ui/opensnitch/service.py
+++ b/ui/opensnitch/service.py
@@ -1,4 +1,5 @@
 from PyQt5 import QtWidgets, QtGui, QtCore
+from PyQt5.QtCore import QCoreApplication as QC
 
 from datetime import datetime, timedelta
 from threading import Thread, Lock, Event
@@ -193,10 +194,29 @@ class UIService(ui_pb2_grpc.UIServicer, QtWidgets.QGraphicsObject):
         gui = self._stats_dialog
         def __show_gui():
             if not tray.isSystemTrayAvailable():
+                self._show_systray_msg_error()
                 gui.show()
 
         QtCore.QTimer.singleShot(10000, __show_gui)
 
+    def _show_systray_msg_error(self):
+        print("")
+        print("WARNING: system tray not available. On GNOME you need the extension gnome-shell-extension-appindicator.")
+        print("\tRead more:", Config.HELP_SYSTRAY_WARN)
+        print("")
+
+        hide_msg = self._cfg.getBool(Config.DEFAULT_HIDE_SYSTRAY_WARN)
+        if hide_msg:
+            return
+        self._desktop_notifications.show(
+            QC.translate("stats", "WARNING"),
+            QC.translate("stats", """System tray not available. Read more:
+{0}
+""".format(Config.HELP_SYSTRAY_WARN)),
+            os.path.join(self._path, "res/icon-white.svg")
+        )
+        self._cfg.setSettings(Config.DEFAULT_HIDE_SYSTRAY_WARN, True)
+
     def _on_tray_icon_activated(self, reason):
         if reason == QtWidgets.QSystemTrayIcon.Trigger or reason == QtWidgets.QSystemTrayIcon.MiddleClick:
             if self._stats_dialog.isVisible() and not self._stats_dialog.isMinimized():