On 8/1/23 15:58, Tim via users wrote:
On Sat, 2023-01-07 at 20:40 -0500, Sam Varshavchik wrote:
Can anyone try using grubby --set-default to change the default boot kernel
to something other than the most recently-installed kernel, successfully?
It tells me that it obeys my request, and grubby --info=DEFAULT shows that
the default boot kernel is what I specified.
But at boot the grub menu still highlights the most recently installed
kernel, and that's what boots by default.
As I recall, there was always several aspects to this.
Each menu stanza for the particular kernel you booted needed to have a
"set default" option set in it. So that when you picked that menu
option at boot time, it set the default variable to itself *and* *then*
booted that kernel. If you booted from a menu choice that didn't
include that option, it wouldn't set itself as the default for the next
boot. It was a per-stanza thing, not a once in the GRUB config, thing.
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|
regards,
Steve
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