more explicit message on how to install tkinter

resources/scripts/layerfx_innerlight.py

@@ -4,7 +4,7 @@ from lazpaint import dialog
 try:
     from tkinter import *
 except ImportError:
-    dialog.show_message("Please install tkinter.")
+    dialog.show_message(""Please install tkinter. On Debian distributions, use the command: apt install python3-tk"")
     exit()
         
 from lazpaint import colors, image, layer, filters, tools, selection

resources/scripts/layerfx_innershadow.py

@@ -4,7 +4,7 @@ from lazpaint import dialog
 try:
     from tkinter import *
 except ImportError:
-    dialog.show_message("Please install tkinter.")
+    dialog.show_message("Please install tkinter. On Debian distributions, use the command: apt install python3-tk")
     exit()
         
 from lazpaint import colors, image, layer, filters, tools, selection

resources/scripts/layerfx_shadow.py

@@ -4,7 +4,7 @@ from lazpaint import dialog
 try:
     from tkinter import *
 except ImportError:
-    dialog.show_message("Please install tkinter.")
+    dialog.show_message("Please install tkinter. On Debian distributions, use the command: apt install python3-tk")
     exit()
         
 from lazpaint import colors, image, layer, filters, tools, selection

resources/scripts/layerfx_stroke.py

@@ -4,7 +4,7 @@ from lazpaint import dialog
 try:
     from tkinter import *
 except ImportError:
-    dialog.show_message("Please install tkinter.")
+    dialog.show_message("Please install tkinter. On Debian distributions, use the command: apt install python3-tk")
     exit()
         
 from lazpaint import colors, image, layer, filters, tools, selection