[SLUG] grub error 15
After doing a routine reboot I get grub error 15 on Ubuntu 8.10 There are 3 drives on the system of which only one is bootable. The UUID's on fstab and menu.lst match. The bootable drive/partition is sdc3 and in the menu.lst it says (hd 0,2) When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
On 26/01/10 23:25, da...@kenpro.com.au wrote: After doing a routine reboot I get grub error 15 on Ubuntu 8.10 Does this error occur before or after the GRUB menu appears? i.e. do you get presented with a menu to select which kernel at all, or does it bomb out before it gets to that stage? When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? It may well be that the GRUB MBR is simply looking at the wrong drive for the menu.lst file. In which case, re-running grub-install would be my first suggestion as a fix. Jeremy. signature.asc Description: OpenPGP digital signature -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
On 26/01/10 23:25, da...@kenpro.com.au wrote: After doing a routine reboot I get grub error 15 on Ubuntu 8.10 Does this error occur before or after the GRUB menu appears? i.e. do you get presented with a menu to select which kernel at all, or does it bomb out before it gets to that stage? When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? It may well be that the GRUB MBR is simply looking at the wrong drive for the menu.lst file. In which case, re-running grub-install would be my first suggestion as a fix. It bombs before the kernel list. I've tried running: #grub-install /dev/sdc Could not find device for /boot: Not found or not a block device. fdisk reports /dev/sdc as the drive that should boot. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
david == david da...@kenpro.com.au writes: On 26/01/10 23:25, da...@kenpro.com.au wrote: After doing a routine reboot I get grub error 15 on Ubuntu 8.10 Does this error occur before or after the GRUB menu appears? i.e. do you get presented with a menu to select which kernel at all, or does it bomb out before it gets to that stage? When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? It may well be that the GRUB MBR is simply looking at the wrong drive for the menu.lst file. In which case, re-running grub-install would be my first suggestion as a fix. david It bombs before the kernel list. I've tried running: david #grub-install /dev/sdc Could not find device for /boot: Not david found or not a block device. Hmmm. This sounds as if the mapping from BIOS to Linux drives is broken. Try grub-install with the --recheck option. -- Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au http://www.ertos.nicta.com.au ERTOS within National ICT Australia -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
david == david da...@kenpro.com.au writes: On 26/01/10 23:25, da...@kenpro.com.au wrote: After doing a routine reboot I get grub error 15 on Ubuntu 8.10 Does this error occur before or after the GRUB menu appears? i.e. do you get presented with a menu to select which kernel at all, or does it bomb out before it gets to that stage? When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? It may well be that the GRUB MBR is simply looking at the wrong drive for the menu.lst file. In which case, re-running grub-install would be my first suggestion as a fix. david It bombs before the kernel list. I've tried running: david #grub-install /dev/sdc Could not find device for /boot: Not david found or not a block device. Hmmm. This sounds as if the mapping from BIOS to Linux drives is broken. Try grub-install with the --recheck option. The plot thickens . # grub-install --recheck /dev/sdc3 Could not find device for /boot: Not found or not a block device I unplugged all but the root drive and it boots perfectly. Progressively replugging all the drives seems to have random results. There is one IDE drive and three SATA, one of which is the rood drive and another one is in a caddy. I have had as many as two of the four extra drives running but can't get them all to go at once. I'm beginning to think it's a BIOS/motherboard problem. I've just rebooted again with only the boot drive plugged in. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
da...@kenpro.com.au wrote: david == david da...@kenpro.com.au writes: On 26/01/10 23:25, da...@kenpro.com.au wrote: After doing a routine reboot I get grub error 15 on Ubuntu 8.10 Does this error occur before or after the GRUB menu appears? i.e. do you get presented with a menu to select which kernel at all, or does it bomb out before it gets to that stage? When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? It may well be that the GRUB MBR is simply looking at the wrong drive for the menu.lst file. In which case, re-running grub-install would be my first suggestion as a fix. david It bombs before the kernel list. I've tried running: david #grub-install /dev/sdc Could not find device for /boot: Not david found or not a block device. Hmmm. This sounds as if the mapping from BIOS to Linux drives is broken. Try grub-install with the --recheck option. The plot thickens . # grub-install --recheck /dev/sdc3 Could not find device for /boot: Not found or not a block device I unplugged all but the root drive and it boots perfectly. Progressively replugging all the drives seems to have random results. There is one IDE drive and three SATA, one of which is the rood drive and another one is in a caddy. I have had as many as two of the four extra drives running but can't get them all to go at once. I'm beginning to think it's a BIOS/motherboard problem. I've just rebooted again with only the boot drive plugged in. I'll wager you have the grub MBR sitting on one of your other drives and the bios (as most do) randomly changes the boot order when you add new drives, so having that one in a caddy will mess with things. when it decides to boot off the one with the other grub you get an error. you can zero it if you want and see if that helps backup first dd if=/dev/hda of=/mbrbackup.bin bs=512 count=1 then zero dd if=/dev/zero of=/dev/hda bs=446 count=1 note the 446 bytes, if you do 512 it'll wipe the partition table (which is a bad thing) if your lucky that'll be enough that the bios will skip those when it comes to boot time. make sure your fstab is all done by uuid not path because that will probably change as you add and remove drives or the phase of the moon changes. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
da...@kenpro.com.au wrote: Snip # grub-install --recheck /dev/sdc3 Could not find device for /boot: Not found or not a block device I unplugged all but the root drive and it boots perfectly. Progressively replugging all the drives seems to have random results. There is one IDE drive and three SATA, one of which is the rood drive and another one is in a caddy. I have had as many as two of the four extra drives running but can't get them all to go at once. I'm beginning to think it's a BIOS/motherboard problem. I've just rebooted again with only the boot drive plugged in. Just a thought, but some BIOSes have trouble mixing SATA and IDE drives (Mine - Athalon64 Gigabyte board - is an example). One option to try if the boot drive is SATA then physically set the IDE drive to slave. It should then be moved to the end of the list. Most older BIOSes check for IDE drives first then look for SATA drives so it is not a great idea to mix the two. Heracles -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
On 27/01/10 09:56, da...@kenpro.com.au wrote: It bombs before the kernel list. I've tried running: #grub-install /dev/sdc Could not find device for /boot: Not found or not a block device. fdisk reports /dev/sdc as the drive that should boot. Likely because you're running it from the live CD, and it's trying to find the block device for your ramdisk. Try this, or commands to this effect: $ mkdir /tmp/ubuntu $ mount -t ext3 /dev/sdc3 /tmp/ubuntu $ grub-install --recheck --root-directory=/tmp/ubuntu /dev/sdc $ umount /tmp/ubuntu Jeremy. signature.asc Description: OpenPGP digital signature -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
Re: [SLUG] grub error 15
This is still a mystery. However, I re-ordered the SATA leads so that the root drive was on SATA 0. It now boots with all drives working. Is this black magic? I didn't change the IDE. Interestingly, the noise that I thought was a beetle dying in the back of a cupboard turned out to be a noise in the power supply of this machine! The noise started yesterday, not long before I first ran into this problem. Is this a co-incidence? I'm now pretty sure the power supply is on the way out. I've been regularly re-booting this configuration for about a year without it every causing problems previously. da...@kenpro.com.au wrote: david == david da...@kenpro.com.au writes: On 26/01/10 23:25, da...@kenpro.com.au wrote: After doing a routine reboot I get grub error 15 on Ubuntu 8.10 Does this error occur before or after the GRUB menu appears? i.e. do you get presented with a menu to select which kernel at all, or does it bomb out before it gets to that stage? When I enter the BIOS I am only getting one option for booting into a hard-drive, although I recollect that previously I had to select which hard drive. The BIOS does recognise all three hard drives as being present. I am able to mount the bootable drive from a live CD and the data appears to be OK. Any suggestions what has gone amiss? It may well be that the GRUB MBR is simply looking at the wrong drive for the menu.lst file. In which case, re-running grub-install would be my first suggestion as a fix. david It bombs before the kernel list. I've tried running: david #grub-install /dev/sdc Could not find device for /boot: Not david found or not a block device. Hmmm. This sounds as if the mapping from BIOS to Linux drives is broken. Try grub-install with the --recheck option. The plot thickens . # grub-install --recheck /dev/sdc3 Could not find device for /boot: Not found or not a block device I unplugged all but the root drive and it boots perfectly. Progressively replugging all the drives seems to have random results. There is one IDE drive and three SATA, one of which is the rood drive and another one is in a caddy. I have had as many as two of the four extra drives running but can't get them all to go at once. I'm beginning to think it's a BIOS/motherboard problem. I've just rebooted again with only the boot drive plugged in. I'll wager you have the grub MBR sitting on one of your other drives and the bios (as most do) randomly changes the boot order when you add new drives, so having that one in a caddy will mess with things. when it decides to boot off the one with the other grub you get an error. you can zero it if you want and see if that helps backup first dd if=/dev/hda of=/mbrbackup.bin bs=512 count=1 then zero dd if=/dev/zero of=/dev/hda bs=446 count=1 note the 446 bytes, if you do 512 it'll wipe the partition table (which is a bad thing) if your lucky that'll be enough that the bios will skip those when it comes to boot time. make sure your fstab is all done by uuid not path because that will probably change as you add and remove drives or the phase of the moon changes. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
