Re: How to customize GRUB menu entries (order, what they say, etc.)?
Reply #9 –
The correct way would be to read the coments in /etc/default/grub.
The solution looks like this:
GRUB_DEFAULT="saved"
GRUB_SAVEDEFAULT="true"
GRUB_DISABLE_SUBMENU="y"
don't forget update-grub after that.