diff -r b9456394d24f -r 86897f8a6598 src/java.desktop/share/classes/javax/swing/plaf/basic/BasicMenuUI.java
--- a/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicMenuUI.java	Mon Jun 25 16:01:01 2018 +0530
+++ b/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicMenuUI.java	Mon Jun 25 12:50:25 2018 +0530
@@ -129,7 +129,8 @@
         int[] shortcutKeys = (int[])DefaultLookup.get(menuItem, this,
                                                    "Menu.shortcutKeys");
         if (shortcutKeys == null) {
-            shortcutKeys = new int[] {KeyEvent.ALT_MASK};
+            shortcutKeys = new int[] {KeyEvent.ALT_MASK,
+                    KeyEvent.ALT_MASK | KeyEvent.ALT_GRAPH_MASK};
         }
         if (mnemonic == lastMnemonic) {
             return;