mk1970
October 26th, 2006, 01:32 AM
I installed Ubuntu 6.06.1 and later also 6.10 on a PC with two large SATA disks. I followed my own instructions (http://www.iki.fi/kuparine/comp/ubuntu/raid.html) with the only difference being that both disks have a small area for Windows and normal ext3 filesystem in the beginning of the disks.
Device Boot Start End Blocks Id System
/dev/sda1 1 1216 9767488+ 7 HPFS/NTFS
/dev/sda2 * 1217 2432 9767520 fd Linux raid autodetect
/dev/sda3 2433 2554 979965 fd Linux raid autodetect
/dev/sda4 2555 30515 224596732+ fd Linux raid autodetect
Device Boot Start End Blocks Id System
/dev/sdb1 1 1216 9767488+ 83 Linux
/dev/sdb2 * 1217 2432 9767520 fd Linux raid autodetect
/dev/sdb3 2433 2554 979965 fd Linux raid autodetect
/dev/sdb4 2555 30515 224596732+ fd Linux raid autodetect
There are 3 RAID1 devices (md0 = sda2+sdb2, md1=sda3+sdb3 ja md2=sda4+sdb4) which contain / (md0), swap (md1) and /home (md2).
The Problem
When starting the PC for the first time I saw this error message.
Error 15: File not found
Press any key to continue...
This bug exists at least in Ubuntu 6.06.1 and 6.10 (see this problem report (https://launchpad.net/distros/ubuntu/+source/grub/+bug/46223)) and it appears to exist whenever the /dev/mdN containing the / filesystem does not use the first physical partition (this assumption is my own).
The Problem is caused by an invalid "root (hd0,0)" line in /boot/grub/menu.lst as seen in the following example. hd0 refers to the first harddrive and it is correct. The zero after comma refers to the first partition but since the first partition type is NTFS (because it contains Windows), the boot loader will not find the files needed to boot Ubuntu.
title Ubuntu, kernel 2.6.17-10-generic
root (hd0,0)
kernel /boot/vmlinuz-2.6.17-10-generic root=/dev/md0 ro quiet splash locale=fi_FI
initrd /boot/initrd.img-2.6.17-10-generic
quiet
savedefault
boot
The Solution
When booting the PC for the first time after the installation, go with the arrow keys to the boot menu entry which you want to start. Usually this is the top-most line.
Do NOT press Enter! Press e to edit the entry.
Go to the line which says root (hd0,0) and press e to edit it.
Change the second 0 to the correct number (in the example above the correct number is 1 because the /dev/md0 which contains the / filesystem uses the 2nd physical partition).
Press Enter to access your changes and press b to boot. Your PC should now boot normally.
Open a Terminal (Applications > Accessories > Terminal).
Lauch an editor with sudo gedit /boot/grub/menu.lst
Replace all invalid "root (hd0,0)" entries with "root (hd0,1)".
Save the file and reboot. If the changes were made correctly your PC should start now normally.
Finally it's a good idea to install the boot loader also on the second harddrive so the the PC is able to start even if the first harddrive fails.
# sudo grub
grub> device (hd0) /dev/sdb
grub> root (hd0,1)
grub> setup (hd0)
grub> quit
(My original HOWTO about this problem in Finnish is found here (http://forum.ubuntu-fi.org/index.php?topic=6237.0))
Device Boot Start End Blocks Id System
/dev/sda1 1 1216 9767488+ 7 HPFS/NTFS
/dev/sda2 * 1217 2432 9767520 fd Linux raid autodetect
/dev/sda3 2433 2554 979965 fd Linux raid autodetect
/dev/sda4 2555 30515 224596732+ fd Linux raid autodetect
Device Boot Start End Blocks Id System
/dev/sdb1 1 1216 9767488+ 83 Linux
/dev/sdb2 * 1217 2432 9767520 fd Linux raid autodetect
/dev/sdb3 2433 2554 979965 fd Linux raid autodetect
/dev/sdb4 2555 30515 224596732+ fd Linux raid autodetect
There are 3 RAID1 devices (md0 = sda2+sdb2, md1=sda3+sdb3 ja md2=sda4+sdb4) which contain / (md0), swap (md1) and /home (md2).
The Problem
When starting the PC for the first time I saw this error message.
Error 15: File not found
Press any key to continue...
This bug exists at least in Ubuntu 6.06.1 and 6.10 (see this problem report (https://launchpad.net/distros/ubuntu/+source/grub/+bug/46223)) and it appears to exist whenever the /dev/mdN containing the / filesystem does not use the first physical partition (this assumption is my own).
The Problem is caused by an invalid "root (hd0,0)" line in /boot/grub/menu.lst as seen in the following example. hd0 refers to the first harddrive and it is correct. The zero after comma refers to the first partition but since the first partition type is NTFS (because it contains Windows), the boot loader will not find the files needed to boot Ubuntu.
title Ubuntu, kernel 2.6.17-10-generic
root (hd0,0)
kernel /boot/vmlinuz-2.6.17-10-generic root=/dev/md0 ro quiet splash locale=fi_FI
initrd /boot/initrd.img-2.6.17-10-generic
quiet
savedefault
boot
The Solution
When booting the PC for the first time after the installation, go with the arrow keys to the boot menu entry which you want to start. Usually this is the top-most line.
Do NOT press Enter! Press e to edit the entry.
Go to the line which says root (hd0,0) and press e to edit it.
Change the second 0 to the correct number (in the example above the correct number is 1 because the /dev/md0 which contains the / filesystem uses the 2nd physical partition).
Press Enter to access your changes and press b to boot. Your PC should now boot normally.
Open a Terminal (Applications > Accessories > Terminal).
Lauch an editor with sudo gedit /boot/grub/menu.lst
Replace all invalid "root (hd0,0)" entries with "root (hd0,1)".
Save the file and reboot. If the changes were made correctly your PC should start now normally.
Finally it's a good idea to install the boot loader also on the second harddrive so the the PC is able to start even if the first harddrive fails.
# sudo grub
grub> device (hd0) /dev/sdb
grub> root (hd0,1)
grub> setup (hd0)
grub> quit
(My original HOWTO about this problem in Finnish is found here (http://forum.ubuntu-fi.org/index.php?topic=6237.0))