diff --git a/align.py b/align.py

index c5a66fe..9067676 100755

--- a/align.py

+++ b/align.py

@@ -241,8 +241,13 @@ try:

         #     log.error("Unable to load Qt4 support. Is it installed?")

         #     sys.exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".aligndialog")

+        try:

+            ui = import_module(ui_package + ".aligndialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         #try:

         if 1:

diff --git a/base/queues.py b/base/queues.py

index 04c37b1..dec7fe9 100755

--- a/base/queues.py

+++ b/base/queues.py

@@ -375,8 +375,14 @@ def main_function(passwordObj = None, mode = GUI_MODE, ui_toolkit= UI_TOOLKIT_QT

             sys.exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".queuesconf")

-        setupdialog = import_module(ui_package + ".setupdialog")

+

+        try:

+            ui = import_module(ui_package + ".queuesconf")

+            setupdialog = import_module(ui_package + ".setupdialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         app = QApplication(sys.argv)

         dialog = ui.QueuesDiagnose(None, "","",QUEUES_MSG_SENDING,passwordObj)

diff --git a/base/utils.py b/base/utils.py

index cde819f..0d6e9ff 100644

--- a/base/utils.py

+++ b/base/utils.py

@@ -1,4 +1,4 @@

-#!/usr/bin/env python

+#!/usr/bin/python3

 # -*- coding: utf-8 -*-

 #

 # (c) Copyright 2001-2018 HP Development Company, L.P.

@@ -734,6 +734,13 @@ def checkPyQtImport(): # qt3

         if os.getenv('DISPLAY') and os.getenv('STARTED_FROM_MENU'):

             no_qt_message_gtk()

+        # hplip-gui sub-package (Fedora)

+        try:

+            import ui

+        except ImportError:

+            log.error("hplip-gui not installed.  GUI not available. Exiting.")

+            return False

+

         log.error("PyQt not installed. GUI not available. Exiting.")

         return False

@@ -784,7 +791,8 @@ def checkPyQtImport4():

         import PyQt5

         import ui5

     else:

-        log.debug("HPLIP is not installed properly or is installed without graphical support. Please reinstall HPLIP again")

+        # hplip-gui sub-package (Fedora) requires python3-qt5

+        log.error("Install the hplip-gui package for graphical support.")

         return False

     return True

@@ -2456,6 +2464,7 @@ def checkPyQtImport45():

     except ImportError as e:

         log.debug(e)

+    log.error("Install the hplip-gui package for graphical support.")

     raise ImportError("GUI Modules PyQt4 and PyQt5 are not installed")

@@ -2477,6 +2486,7 @@ def import_dialog(ui_toolkit):

             return  (QApplication, "ui4")

         except ImportError as e:

             log.error(e)

+            log.error("Unable to load Qt support. Is hplip-gui package installed?")

             sys.exit(1)

     elif ui_toolkit == "qt5":

         try:

@@ -2485,9 +2495,7 @@ def import_dialog(ui_toolkit):

             return (QApplication, "ui5")

         except ImportError as e:

             log.error(e)

-            sys.exit(1)

-        else:

-            log.error("Unable to load Qt support. Is it installed?")

+            log.error("Unable to load Qt support. Is hplip-gui package installed?")

             sys.exit(1)

diff --git a/clean.py b/clean.py

index 3d41f04..0141f23 100755

--- a/clean.py

+++ b/clean.py

@@ -193,8 +193,13 @@ try:

     else:

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".cleandialog")

+        try:

+            ui = import_module(ui_package + ".cleandialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         #try:

         if 1:

diff --git a/diagnose_plugin.py b/diagnose_plugin.py

index e4e6ebd..1bcd8c3 100755

--- a/diagnose_plugin.py

+++ b/diagnose_plugin.py

@@ -94,7 +94,14 @@ if mode == GUI_MODE:

         #     sys.exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".plugindiagnose")

+

+        try:

+            ui = import_module(ui_package + ".plugindiagnose")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

+

         from installer import pluginhandler

         app = QApplication(sys.argv)

diff --git a/fab.py b/fab.py

index 9bd6166..e11ebc4 100755

--- a/fab.py

+++ b/fab.py

@@ -854,8 +854,13 @@ if mode == GUI_MODE:

     else: # qt4

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".fabwindow")

+        try:

+            ui = import_module(ui_package + ".fabwindow")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         log.set_module("hp-fab(qt4)")

diff --git a/firmware.py b/firmware.py

index 33e044d..a38058b 100755

--- a/firmware.py

+++ b/firmware.py

@@ -118,7 +118,13 @@ try:

            #  log.error("Unable to load Qt4 support. Is it installed?")

            #  sys.exit(1)

             QApplication, ui_package = utils.import_dialog(ui_toolkit)

-            ui = import_module(ui_package + ".firmwaredialog")

+

+            try:

+                ui = import_module(ui_package + ".firmwaredialog")

+            except ModuleNotFoundError:

+                log.error('HPLIP GUI is not available - use interactive mode '

+                          '(option \'-i\') or install hplip-gui package.')

+                sys.exit(1)

         if ui_toolkit == 'qt3':

            try:

diff --git a/info.py b/info.py

index 6c28531..5b05eda 100755

--- a/info.py

+++ b/info.py

@@ -172,7 +172,13 @@ try:

     else: # GUI mode

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".infodialog")

+

+        try:

+            ui = import_module(ui_package + ".infodialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         if 1:

             app = QApplication(sys.argv)

diff --git a/plugin.py b/plugin.py

index f54f726..58d6006 100755

--- a/plugin.py

+++ b/plugin.py

@@ -252,7 +252,14 @@ if mode == GUI_MODE:

         #     clean_exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".plugindialog")

+

+        try:

+            ui = import_module(ui_package + ".plugindialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

+

         if ui_toolkit == "qt5":

             from PyQt5.QtWidgets import QMessageBox

         elif ui_toolkit == "qt4":

diff --git a/sendfax.py b/sendfax.py

index 491c8f9..0815ee7 100755

--- a/sendfax.py

+++ b/sendfax.py

@@ -211,7 +211,13 @@ if mode == GUI_MODE:

         #     sys.exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".sendfaxdialog")

+

+        try:

+            ui = import_module(ui_package + ".sendfaxdialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         app = QApplication(sys.argv)

         dlg = ui.SendFaxDialog(None, printer_name, device_uri, mod.args)

diff --git a/setup.py b/setup.py

index 2608f95..b09a8ef 100755

--- a/setup.py

+++ b/setup.py

@@ -310,7 +310,12 @@ if mode == GUI_MODE:

         #     clean_exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".setupdialog")

+        try:

+            ui = import_module(ui_package + ".setupdialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         app = QApplication(sys.argv)

         log.debug("Sys.argv=%s printer_name=%s param=%s jd_port=%s device_uri=%s remove=%s" % (sys.argv, printer_name, param, jd_port, device_uri, remove))

diff --git a/testpage.py b/testpage.py

index a5ed2bc..2a707a1 100755

--- a/testpage.py

+++ b/testpage.py

@@ -77,7 +77,13 @@ try:

         #     log.error("Unable to load Qt4 support. Is it installed?")

         #     sys.exit(1)

         QApplication, ui_package = utils.import_dialog(ui_toolkit)

-        ui = import_module(ui_package + ".printtestpagedialog")

+

+        try:

+            ui = import_module(ui_package + ".printtestpagedialog")

+        except ModuleNotFoundError:

+            log.error('HPLIP GUI is not available - use interactive mode '

+                      '(option \'-i\') or install hplip-gui package.')

+            sys.exit(1)

         log.set_module("%s(UI)" % __mod__)