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- - Error message after BIOS | unknown filesystem (https://www.linuxquestions.org/questions/linux-newbie-8/error-message-after-bios-%7C-unknown-filesystem-849585/)

weidemmu

12-10-2010 11:19 PM

Error message after BIOS | unknown filesystem

I installed Kubuntu 10.04 last couple days ago.
Yesterday I installed some package software,
After reboot, I had problem to login in GUI in Kubuntu.
I tried few solutions in web I found,
Now It became more worse !

After BIOS - show this error message

error : unknown filesystem
grub rescue>

anyone can help ? Thanks.

andrewthomas

12-10-2010 11:25 PM

Reinstall grub2 from a liveCD

https://help.ubuntu.com/community/Gr...0from%20LiveCD

weidemmu

12-10-2010 11:36 PM

Hey andrew thank for reply,
I tried | SIMPLEST - Copy GRUB 2 Files from the LiveCD

It seem doesn't work. Here is what I got after followed the commands.

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x69f17e12

Device Boot Start End Blocks Id System
/dev/sda1 1 5 40131 de Dell Utility
/dev/sda2 6 1918 15360000 7 HPFS/NTFS
/dev/sda3 * 1918 36486 277668259+ 7 HPFS/NTFS
/dev/sda4 36486 38914 19502081 5 Extended
/dev/sda5 36486 38807 18642944 83 Linux
/dev/sda6 38807 38914 858112 82 Linux swap / Solaris
ubuntu@ubuntu:~$ sudo mount /dev/sda5 /mnt
mount: you must specify the filesystem type
ubuntu@ubuntu:~$ sudo grub-install --root-directory=/mnt /dev/sda
/usr/sbin/grub-probe: error: cannot find a device for /mnt/boot/grub (is /dev mounted?).
No path or device is specified.
Try `/usr/sbin/grub-probe --help' for more information.
Auto-detection of a filesystem module failed.
Please specify the module with the option `--modules' explicitly.

andrewthomas

12-11-2010 08:25 AM

Code:

sudo mount /dev/sda5 /mnt

sudo grub-install --root-directory=/mnt/ /dev/sda

I don't know why you got this error message after the first command:

Code:

mount: you must specify the filesystem type

But you did miss the trailing / in the --root-directory=/mnt/
You might also want to add

Code:

-t ext4

to the mount command to see if the error goes away.

markush

12-11-2010 09:13 AM

Hello weidemmu and welcome to LQ,

referring to the errormessage you've a kernel which does not support the ext4 file-system, i.e. the kernel is too old to handle ext4, or the partition /dev/sda5 is not formatted (which seems unlikely).

In order to check if the kernel of the live-CD supports ext4 filesystem you'll have to find the .config file for the kernel, either in /usr/src/linux or in /boot and execute the command

Code:

grep -i ext4 nameoftheconfigfile

and post the output here.

If the kernel of the live-CD supports ext4 with a module, it may be that the module is not loaded, you can load it with

Code:

modprobe ext4

Markus

weidemmu

12-11-2010 11:43 AM

Andrew - I added the trailing, output still same.
I issued command -t ext4

ubuntu@ubuntu:~$ sudo mount -t ext4 /dev/sda5 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sda5,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

Markus - Here is the result

ubuntu@ubuntu:~$ grep -i ext4 nameoftheconfigfile
grep: nameoftheconfigfile: No such file or directory
ubuntu@ubuntu:~$ modprobe ext4
FATAL: Module ext4 not found.

Thank for kindly help, I wish you two can help me further.
Could you brief describe commands ? Thanks.

markush

12-11-2010 12:28 PM

Well, I meant you should search for the configfile and substitute the word nameoftheconfigfile with the real config-file. It normally resides as ".config" in the /usr/src/linux directory, but I'm not sure if this is true for your live-CD. As an example. On my machine:

Code:

samsung:/usr/src/linux# grep -i ext4 .config

CONFIG_EXT4_FS=m

CONFIG_EXT4_FS_XATTR=y

CONFIG_EXT4_FS_POSIX_ACL=y

CONFIG_EXT4_FS_SECURITY=y

# CONFIG_EXT4_DEBUG is not set

you see, that ext4 support is configured as a module.

Markus

weidemmu

12-11-2010 08:45 PM

1 Attachment(s)

I cant login in to Kubuntu.
After BIOS, It jump to grub prompt

grub >

What commands I can use in this prompt to get me in Kubuntu ?

I cant find the directory by using live-CD.

I have attached a .txt for boot info script, see what can help.

andrewthomas

12-11-2010 09:30 PM

You have legacy grub (0.97) and not grub2. You should follow these instructions for reinstallation.

https://help.ubuntu.com/community/Gr...talling%20GRUB

You seem to lack a /boot/grub/menu.lst file. What exactly have you done? What version of Kubuntu is this?

You state in the first post that it is 10.04, but then there would be grub2 and not grub.

weidemmu

12-11-2010 10:39 PM

I'm using Kubuntu 10.04 LTS Desktop Edition

I'm not sure what I had done cause this.

I was having problem after installed Kubuntu with Window Vista last 3 days ago.

First time reboot was no problem, I logged in Vista.
2nd time reboot failed.
I got this message :

" no module name found
Aborted. Press any key to exit.
Broadcom UNDI PXE-2.1 v11.0.9
Copyright (C) 2000-2009, Broadcom Corporation
Copyright (C) 1997-2000, Intel Corporation
All rights reserved.

PXE-E61 : Media test failure, check cable
PXE-M0F : Exiting Broadcom PXE COM.
Operating System not found"

I found this solution at one web
I boot my Live-cd and issued this commands

sudo mount /dev/sda5 /mnt
sudo grub-install --recheck --root-directory=/mnt /dev/sda

problem solved, but once I login Vista and reboot, problem come.
I tried few times above commands.

Last 2 days ago, I did commands to install desktop screen recorder - xvidcap.

sudo apt-get install xvidcap

After reboot, current problem come.

weidemmu

12-11-2010 10:46 PM

Hey, Andrew

I followed reinstalling using GUI.

Selected manuall partition.

I click on my linux partition sda5
Which mount point should I select ?

I selected /boot , after that I select forward

Error Message :

No root file system is defined.
Please correct this from the partitioning menu.

andrewthomas

12-11-2010 11:08 PM

You don't have a separate /boot partition so you should choose /.

Furthermore, I think that your Dell recovery partition is overwriting the mbr ( https://bugs.launchpad.net/ubuntu/+s...b2/+bug/482757 ) .

See this post for a fix.

http://ubuntuforums.org/showthread.p...12#post9081112

For future reference, this is a great grub2 thread:

http://ubuntuforums.org/showthread.php?t=1195275

weidemmu

12-12-2010 12:36 AM

Andrew,

By selecting mount /. will it delete all files in my Kubuntu partition ?

like picture,video,doc.

andrewthomas

12-12-2010 07:59 AM

Is this a Kubuntu 10.04 LiveCD? If it is, then I am not sure that method will work.
I am unsure how you got grub on your HD.
I would install grub2 from within a chroot.
Using METHOD 3 - CHROOT : again from https://help.ubuntu.com/community/Gr...0from%20LiveCD
except that you don't have grub2 installed so you must install it first.
You could either cut and paste the mount commands into the terminal one at a time or copy the entire thing (including the #!/bin/bash) into kwrite and save it to your liveCD desktop as chroot, and make it executable. Then, after switching your terminal to the directory that contains the file, run the file by typing

Code:

./chroot

Code:

#!/bin/bash

sudo mount /dev/sda5 /mnt/

sudo mount --bind /proc /mnt/proc

sudo mount --bind /dev /mnt/dev

sudo mount --bind /dev/pts /mnt/dev/pts

sudo mount --bind /sys /mnt/sys

sudo mount --bind /etc/resolv.conf /mnt/etc/resolv.conf

sudo chroot /mnt/ /bin/bash

# enter sudo apt-get install grub-pc here <ctl-d> or exit to quit

sudo umount /mnt/etc/resolv.conf

sudo umount /mnt/sys

sudo umount /mnt/dev/pts

sudo umount /mnt/dev

sudo umount /mnt/proc

sudo umount /mnt/

markush

12-12-2010 09:01 AM

Hi,

I don't think this will work. One has to mount the devices before chrooting!

I would use the following

Code:

mount /dev/sda5 /mnt

mount -t proc none /mnt/proc

mount -o bind /dev /mnt/dev

chroot /mnt /bin/bash

this is how it works with Gentoo.

Markus

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