On 9/1/23 03:54, Sam Varshavchik wrote:
Stephen Morris writes:
And at boot/reboot, GRUB had to be configured to read the default
variable to see which menu item to boot.
I lack the perseverance to read through the conglomeration of GRUB menu
files to see what it does these days.
From a google check for the default grub kernel boots it seems that
if you add the following two statements into /etc/default/grub and
then run grub2-mkconfig grub will use the last selected kernel as the
default boot kernel.
GRUB_SAVEDEFAULT=true
GRUB_DEFAULT=saved
I have never diddled my /etc/default/grub. Currently it has only
GRUB_DEFAULT=saved
a bunch of other stuff, no explicit GRUB_SAVEDEFAULT=true. I wonder
what that ends up doing…
My /etc/default/grub is the same. I only ever have 1 kernel entry in the
main menu section for Fedora and Ubuntu, the other kernels are in
sub-menus. When I boot the Fedora kernel is the first entry in the menu
and when the count down timer expires Fedora is booted. I am assuming
that if instead I booted into Ubuntu or Windows for that matter the
combination of the two statements would cause all subsequent boots to
boot either Ubuntu or Windows (depending on which one was booted in to)
until such time as a different menu entry was selected and then it would
become the default boot entry. Again from what I have read, these two
statements don't work if you have booted from a sub-menu, other steps
need to be taken to make that entry the default boot entry.
regards,
Steve
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