Index: grub-1.99/util/grub.d/10_linux.in
===================================================================
--- grub-1.99.orig/util/grub.d/10_linux.in
+++ grub-1.99/util/grub.d/10_linux.in
@@ -144,6 +144,7 @@ esac
 prepare_boot_cache=
 prepare_root_cache=
 
+in_submenu=false
 while [ "x$list" != "x" ] ; do
   linux=`version_find_latest $list`
   echo "Found linux image: $linux" >&2
@@ -196,4 +197,13 @@ while [ "x$list" != "x" ] ; do
   fi
 
   list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '`
+
+  if [ "$list" ] && ! $in_submenu; then
+    echo "submenu \"Previous Linux versions\" {"
+    in_submenu=:
+  fi
 done
+
+if $in_submenu; then
+  echo "}"
+fi