update-grub help

[Dave Howorth]

Goh Lip wrote:
> Welcome and good to hear that. The 2 most useful grub commands are 
> "update-grub" and "grub-install" You would also get it working by
> "sudo grub-install /dev/sda"
> as this 'grand-daddy' command will include "grub-mkdevicemap" and other 
> commands as well. "grub-mkdevicemap" is just more 'surgical'. As Suse is 
> installed after karmic, the mapping does not exist and needs to be created.

I like surgical :) I've had too many near death experiences when grub or
the hardware or the os or my tired brain misunderstand each other and
things go awry.

So I tried to boot from the revised grub.cfg and it failed with "error:
no such device" so I've commented out lines in
/usr/lib/grub/grub-mkconfig_lib so as not to generate search lines in
grub.cfg as described in
http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot_Problems:search

But it still doesn't work. It now says "you need to load the kernel
first" and my googling hasn't answered that yet. The relevant stanza in
grub.cfg is:

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Desktop -- openSUSE 11.2 - 2.6.31.5-0.1 (on /dev/sdf1)" {
        insmod ext2
        set root=(hd5,1)
        linux /boot/vmlinuz-2.6.31.5-0.1-desktop
root=/dev/disk/by-id/ata-WDC_WD5001AALS-00L3B2_WD-WCASYA878047-part1
resume=/dev/disk/by-id/ata-WDC_WD5001AALS-00L3B2_WD-WCASYA878047-part2
splash=silent quiet showopts vga=0x31a
        initrd /boot/initrd-2.6.31.5-0.1-desktop
}

Cheers, Dave