[solved] Arch kernel panic with grub 2 (another instance)

visser · 2009-12-07 21:16:09

Hey all,

I read through this thread: http://bbs.archlinux.org/viewtopic.php?pid=663976 which is somewhat similar to my problem, but not the same.

I successfully installed Arch with a VMware VM, got gnome, openbox, and lxde installed... mucked around a bit. All looked good so I wanted to try it with an actual install.

Background:
I am new to Arch and relatively new to Linux... although not afraid of the terminal.
I am running a Lenovo SL500 laptop.
The laptop has one drive (sda) and is divided as following:
sda1: service partition (required for this machine)
sda2: ntfs containing Windows 7
sda3: extended partition containing:
sda5: linux swap
sda6: ntfs data storage
sda7: ext4 ubuntu 9.10
sda8: ext4 arch

Here is what I did:

I installed arch to sda8, and when it came time for me to set the boot partition I selected 'none' as I wanted to use grub2 which is already installed via the ubuntu installation.

When the installation of arch finished, I rebooted into my ubuntu system and ran update-grub. The output verified that Arch was located at sda8, and the grub.cfg file shows:

menuentry "Arch (on /dev/sda8)" {
insmod ext2
set root=(hd0,8)
search --no-floppy --fs-uuid --set 5ee916d1-5051-4e27-9c1f-a74f04693337
linux /boot/vmlinuz26 root=/dev/sda8
}

When I attempt to boot into arch, as it is above, I get:
Unable to mount filesystem
not syncing : VFS : Unable to mount root fs on unknown block (0,0)

Now... when I installed arch I formated the partition to ext4, I have verified that it is ext4, and the fstab in the arch partition lists it as ext4. When I altered the above grub2 boot parameters and changed ext2 to ext4, it returned 'error - file not found'.

Any idea where I went wrong or what I should try to fix this?
Should I have installed a bootloader with the arch install?

Thanks for any help

Last edited by visser (2009-12-09 18:48:27)

fabertawe · 2009-12-09 13:14:14

My grub2 installation was also via Ubuntu and the auto-detected entry didn't work, so in /etc/grub.d/40_custom (Ubuntu) I have this...

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
menuentry "Arch Linux (on /dev/sda5)" {
    set root=(hd0,5)
    linux /boot/vmlinuz26 root=/dev/disk/by-uuid/80db2d73-6dea-465c-a9a2-b14624badc57 ro
    initrd /boot/kernel26.img
}
menuentry "Arch Linux (fallback)" {
    set root=(hd0,5)
    linux /boot/vmlinuz26 root=/dev/disk/by-uuid/80db2d73-6dea-465c-a9a2-b14624badc57 ro
    initrd /boot/kernel26-fallback.img
}
menuentry "Windows XP" {
set root=(hd0,1)
chainloader +1
}

I believe you can disable os_prober by adding

GRUB_DISABLE_OS_PROBER="true"

to /etc/default/grub. I disabled it myself by the other method, removing it's executable flag...

sudo chmod -x /etc/grub.d/30_os-prober

I should point out that I haven't installed grub2 in Arch yet as I'm still in the transitional (and undecided) stage.

visser · 2009-12-09 18:47:38

Thanks fabertawe, you helped me fix it.

All I needed to do was copy the correct uuid from my grub.cfg file, then I added your Arch entries into my 40_custom file and changed the uuid to the correct one... now it works.

Cheers.

fabertawe · 2009-12-10 10:47:24

No problem, glad I could help.

nikhil760 · 2009-12-20 15:53:21

Thanks fabertawe i was looking for this too, worked well.

Arch Linux

#1 2009-12-07 21:16:09

[solved] Arch kernel panic with grub 2 (another instance)

#2 2009-12-09 13:14:14

Re: [solved] Arch kernel panic with grub 2 (another instance)

#3 2009-12-09 18:47:38

Re: [solved] Arch kernel panic with grub 2 (another instance)

#4 2009-12-10 10:47:24

Re: [solved] Arch kernel panic with grub 2 (another instance)

#5 2009-12-20 15:53:21

Re: [solved] Arch kernel panic with grub 2 (another instance)

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