Hi all,
Mr. Bean I shutdown the comp. Cold-booted the comp. & waited
for GRUB to kick in. I chainloaded to GRUB 2 ( it shows up as GRUB
version 1.95) and while the entries are there they are not working.
Some things which might give pointer are :-
title Chainload into GRUB 2
root (hd0,0)
kernel /boot/grub/core.img
savedefault
title Debian GNU/Linux, kernel 2.6.22-6-generic
root (hd0,0)
kernel /boot/vmlinuz-2.6.22-6-generic
root=UUID=7eedd8c9-0471-4a63-af65-939402ec5b4e ro quiet splash
initrd /boot/initrd.img-2.6.22-6-generic
savedefault
title Debian GNU/Linux, kernel 2.6.22-6-generic (recovery mode)
root (hd0,0)
kernel /boot/vmlinuz-2.6.22-6-generic
root=UUID=7eedd8c9-0471-4a63-af65-939402ec5b4e ro single
initrd /boot/initrd.img-2.6.22-6-generic
savedefault
title Debian GNU/Linux, kernel memtest86+
root (hd0,0)
kernel /boot/memtest86+.bin
Grub legacy
### BEGIN /etc/grub.d/00_header ###
set default=0
set timeout=100
set root=(hd1,1)
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry "Debian GNU/Linux, linux 2.6.22-7-generic" {
linux (hd1,1)/boot/vmlinuz-2.6.22-7-generic root=/dev/sdb1 ro
initrd (hd1,1)/boot/initrd.img-2.6.22-7-generic
}
menuentry "Debian GNU/Linux, linux 2.6.22-7-generic (single-user mode)" {
linux (hd1,1)/boot/vmlinuz-2.6.22-7-generic root=/dev/sdb1 ro single
initrd (hd1,1)/boot/initrd.img-2.6.22-7-generic
}
menuentry "Debian GNU/Linux, linux 2.6.22-6-generic" {
linux (hd1,1)/boot/vmlinuz-2.6.22-6-generic root=/dev/sdb1 ro
initrd (hd1,1)/boot/initrd.img-2.6.22-6-generic
}
menuentry "Debian GNU/Linux, linux 2.6.22-6-generic (single-user mode)" {
linux (hd1,1)/boot/vmlinuz-2.6.22-6-generic root=/dev/sdb1 ro single
initrd (hd1,1)/boot/initrd.img-2.6.22-6-generic
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
linux (hd1,1)/boot/memtest86+.bin
}
### END /etc/grub.d/20_memtest86+ ###
Grub 1.95 version
Ok the first thing is GRUB legacy starts at the MBR. from where I
guess it finds which place to jump to the hdd to start booting &
reading stuff . ( IIRC this is called bootstrapping) while the newer
one shows location of the hdd. The simplest way would be perhaps to
just change something like :-
linux (hd1,1)/boot/vmlinuz-2.6.22-7-generic root=/dev/sdb1 ro
to
linux (hd0,0)/boot/vmlinuz-2.6.22-7-generic root=/dev/sdb1 ro
although should root=/dev/sdb1 is good enough or should it have the
full UUID as given in grub legacy above ?
linux (hd0,0)/boot/vmlinuz-2.6.22-7-generic
root=UUID=7eedd8c9-0471-4a63-af65-939402ec5b4e ro
Would that be the correct way? I ask because ubuntu now uses UUID labels
https://help.ubuntu.com/community/UsingUUID
I'm sure quite a few of the things which I have asked would be
standard FAQs for the new GRUB. Hopefully Khaled Hosny is also
listening and can add to his list of things if he feels like doing
documentation :)
Another thing I found out is a simple grub-update is able to change
the grub.cfg to its previous state of 444 . With a simple sudo chmod
was able to change that :)
Lemme know how to proceed & would do accordingly.
--
Shirish Agarwal
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