Is there an easy way to disable Grub2 new submenu structure? I'd like to have back the old structure (each option as a menuentry) where each kernel is visible and selectable on the fly.

I've already tried this solution, to no avail. And this is the most promising solution I've found until now. I didn't try it (I'll test it tomorrow) but I was wondering if there is a better way.

Thanks for any help.