Index: gdm-3.29.90/libgdm/gdm-sessions.c
===================================================================
--- gdm-3.29.90.orig/libgdm/gdm-sessions.c	2018-06-26 19:59:06.000000000 +0200
+++ gdm-3.29.90/libgdm/gdm-sessions.c	2018-08-04 00:34:12.709684550 +0200
@@ -212,6 +212,34 @@ collect_sessions_from_directory (const c
         g_dir_close (dir);
 }
 
+static gboolean
+find_translated_name (const char     *id,
+                      GdmSessionFile *session,
+                      char           *translated_name)
+{
+        if (g_str_equal (id, "default"))
+                return FALSE;
+
+        return g_str_equal (session->translated_name, translated_name) ? TRUE : FALSE;
+}
+
+static void
+remove_duplicated_session_name (void)
+{
+        GdmSessionFile *session;
+        char           *translated_name = NULL;
+
+        session = g_hash_table_lookup (gdm_available_sessions_map, "default");
+        if (session)
+                translated_name = session->translated_name;
+
+        if (translated_name) {
+                session = g_hash_table_find (gdm_available_sessions_map, (GHRFunc)find_translated_name, translated_name);
+                if (session)
+                        g_hash_table_remove (gdm_available_sessions_map, session->id);
+        }
+}
+
 static void
 collect_sessions (void)
 {
@@ -269,6 +269,7 @@ collect_sessions (void)
 #ifdef ENABLE_USER_DISPLAY_SERVER
         if (g_getenv ("WAYLAND_DISPLAY") == NULL && g_getenv ("RUNNING_UNDER_GDM") != NULL) {
                 g_array_free (wayland_search_array, TRUE);
+                remove_duplicated_session_name();
                 return;
         }
 #endif
@@ -279,6 +280,8 @@ collect_sessions (void)
 
         g_array_free (wayland_search_array, TRUE);
 #endif
+
+        remove_duplicated_session_name();
 }
 
 /**