Robert McBroom composed on 2025-03-27 00:02 (UTC-0400):
> Felix Miata wrote:
>> Simplest: remove Grub from B, or disable Grub on B. Only one Grub per PC is
>> needed. After each new kernel is installed to B, update Grub on A with
>> os-prober
>> enabled and with GRUB_DISABLE_SUBMENU="y" in /etc/default/grub. Even that
>> frequent
>> Grub maintenance effort isn't needed if you configure your Grub to boot using
>> kernel and initrd symlinks instead of specific kernel and symlink versions.
>> I don't have any dual boot PCs. Mine are all multiboot, 10 or more GNU/Linux
>> installations per PC on most. Fewest has 4. 2 have more than 40 each.
> Could you give an example?
Example of what exactly?
# grep menuentry /boot/grub2/custom.cfg | wc -l
31
# grep -A6 dora /boot/grub2/custom.cfg
menuentry "Fedora 42 defkernel on P22" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt22 --label
<filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0
ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off
video=1440x900@60
initrd /boot/initrd
}
--
menuentry "Fedora 41 defkernel 3 on P25" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt25 --label
<filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0
ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off
video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 39 defkernel 3 on P15" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt15 --label
<filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0
ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off
video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 40 defkernel 3 on P18" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt18 --label
<filter>
linux /boot/vmlinuz root=LABEL=<filter> noresume audit=0
ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off
video=1440x900@60 3
initrd /boot/initrd
}
--
menuentry "Fedora 42 oldkernel 3 on P22" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt22 --label
<filter>
linux /boot/vmlinuz-old root=LABEL=<filter> noresume audit=0
ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off
video=1440x900@60 3
initrd /boot/initrd-old
}
--
menuentry "Fedora 42 test kernel 3 on P22" {
load_video
set gfxpayload=keep
search --no-floppy --set=root --hint-baremetal=ahci0,gpt22 --label
<filter>
linux /boot/vmlinuz-tst root=LABEL=<filter> noresume audit=0
ipv6.disable=1 net.ifnames=0 consoleblank=0 preempt=full mitigations=off
video=1440x900@60 3
initrd /boot/initrd-tst
}
# fdisk -l /dev/nvme0n1 | grep nux | wc -l
26
# ls -gGh /disks/f39/boot/initrd-*
lrwxrwxrwx 1 36 Dec 30 17:22 /disks/f39/boot/initrd-cur ->
initramfs-6.11.9-100.fc39.x86_64.img
lrwxrwxrwx 1 37 Oct 30 23:22 /disks/f39/boot/initrd-old ->
initramfs-6.10.13-100.fc39.x86_64.img
lrwxrwxrwx 1 36 Aug 12 2024 /disks/f39/boot/initrd-old2 ->
initramfs-6.9.12-100.fc39.x86_64.img
# ls -gGh /etc/grub.d/*cust*
-rwxr-xr-x 1 216 Feb 11 2017 /etc/grub.d/07_custom
-rwxr-xr-x 1 0 Aug 9 2018 /etc/grub.d/40_custom
-rwxr-xr-x 1 0 Aug 9 2018 /etc/grub.d/41_custom
#
Because of 07_custom, which is merely a copy of the OEM/upstream 41_custom,
the Grub bootloader displays the stanzas from custom.cfg first in the boot
menu presented, followed by those from auto-generated entries in grub.cfg.
40_custom or a copy of it renamed could be used as initial template instead,
to contain the custom stanzas instead of using a custom.cfg file (AIUI).
see also:
<https://forums.opensuse.org/t/how-to-have-a-custom-uefi-grub-menu-for-a-multiboot-system/133541>
--
Evolution as taught in public schools is, like religion,
based on faith, not based on science.
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata
--
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