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Old 07-12-2005, 05:47 AM   #1
ethics
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Rescuing Fedora Core 4


Ok the general jist is i had to re-install windows XP and of course, my MBR has been stolen again. I researched into using the Rescue CD so popped it in, booted and went through the options, however when it came to detecting the file system it said there were no Linux partitions

Ok i thought, i'll do it manually, so i mounted my Linux partition under /mnt/sources (one of 2 directories in mount on the cd.

with mount /dev/hda5

i then did chroot /dev/hda5 checked my filesystem and it was indeed the right one.

Now comes the problem, when issuing the grub-install /dev/hda? i get

not a valid block device or file, with any partition i try.

I also ls -a in /dev and the only output is null.

Basically i'm wondering if it's borked and i ned to reinstall, i have some home files i'd like to recover (configs for fluxbox etc.) i know ,should have backed them up first :S

I appreciate your help
 
Old 07-12-2005, 12:29 PM   #2
WhatsHisName
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To make a long story short, try doing a so-called native Grub installation from FC Rescue mode or with a Live-CD distro (e.g., Knoppix).


Installing grub natively requires a bit more knowledge, but it can usually overcome most grub problems associated with booting linux. (Notice how I didn’t say anything about fixing problems associated with booting windows?) Grub-install is just a shell script that invokes the grub shell.

Look in the Grub Manual ( http://www.gnu.org/software/grub/manual/grub.html ) in the section entitled “Installing GRUB natively” and try using the “find ...”, “root ...” and “setup ...” commands, in that order, from the grub prompt. If “/boot” is part of the “/” partition, you will:

grub> find /boot/grub/stage1

If “/boot” is a separate partition, you will:

grub > find /grub/stage1


I suspect that grub-install failed because you have a separate “/boot” partition. As I understand it, to use grub-install as you did, you need to have the fully reconstituted FC installation mounted (or at least the /boot part) in rescue mode. I am guessing that what you did was to mount the “/” partition without mounting “/boot” under it before issuing chroot.

Grub-install will only look in the mounted “/” folder, unless you tell it to do something else. You can use grub-install with that partially mounted configuration or without anything mounted, but you need to use the --root-directory option:

grub-install --root-directory=/boot /dev/hda

This is covered in the Grub Manual in the “Installing GRUB using grub-install” section, but it’s a lot easier to just do a native grub installation and to remember how you did it for the next time something goes wrong.
 
Old 07-14-2005, 04:05 AM   #3
james.farrow
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boot using the rescue cd.
chroot /mnt/sysimage
grub-install /dev/hda

as long as there was no errors reported grub is now the bootloader
 
Old 07-14-2005, 06:28 AM   #4
ethics
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Linux can no longer see any devices on the machine, i tried that, ended up formatting the partitions, but thanks for all your help
 
  


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