but that is the bios, I would like to have a menu to select from and that has a countdown of several seconds so that one of the two starts by default.
Indirectly that's how it works;
Boot/BIOS logo is shown for 7 secs (time can be set in BIOS), unless 'F7' is pressed (showing OS section only, NOT BIOS settings!) LE is started automatically.
Only differences are:
- User has to manually press 'F7' to fire up the menu for selection of 'secondary' OS (Win10 in my case) .
- This menu is managed by HW/AMI BIOS not by OS/GRUB.