On Tue, 11 Feb 2025 21:44:58 +0800
hlyg <hlyg2023@outlook.com> wrote:

Thank Curley, but i have solved on my own

Excellent.

isn't installer syslog supposed to record my choice during
installation?

Yes, and a couple other files in /var/log/installation.

i let bios boot 2nd disk, which also has deb12, run update-grub

now it can boot newly-installed deb12 on 1st disk,

then follow stanza at

https://www.gnu.org/software/grub/manual/grub/html_node/Chain_002dloading.html#Chain_002dloading

and create my own and insert to grub.cfg

menuentry "bsd"{
insmod chain
set root=(hd0,1)
chainloader +1}

run grub-install, it's done

Careful, now. The next time you run grub-update that will be
obliterated. You should put that into an appropriate file in
/etc/grub.d so it will get added to /boot/grub/grub.cfg by grub-update.

deb12 installer is buggy, perhaps it is confused by 3 disks(2 sata
disks and 1 usb installation stick) ?

It should be possible to specify where you want the Debian installer to
install grub. It may suggest /dev/sda, as that is a common choice, but
you should be able to edit that. The live CDs provide a different
installer; I have do idea what that does.

old wisdom of dual boot still works

Good.


--
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https://charlescurley.com/blog/

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