Gentoo: error message ‘Unable to mount root fs on unknown-block 2,0’

**Man-Than** · 02-06-2011

Well I have installed Gentoo on the computer of mine. I have noticed that i am unable to boot the and it seems to producing an error message on the computer of mine. following the grub.conf of mine.

Code:

default 0 
timeout 15 
splashimage=(hd0,4)/boot/grub/splash.xpm.gz 

# GNU/Linux 
title Gentoo Linux 2.6.36-r8 
kernel /boot/kernel-2.6.36-gentoo-r8 root=/dev/hda5 
root (hd0,4) 

title Gentoo Linux 2.6.36-r8 (rescue) 
kernel /boot/kernel-2.6.36-gentoo-r8 root=/dev/hda5 init=/bin/bb 
root (hd0,4) 

############### 
# Window$    # 
############### 
title Windows 7 
rootnoverify (hd0,0) 
makeactive 
chainloader +1

Let me know why I am getting this particular issue on the computer of mine. Thanks a lot in advance.

**windows_user** · 02-06-2011

I am asking following question which you should answer so that I can understand the situation properly. Well let me know about the hardware configuration of the system of yours? Do you have done any recent changes on the computer? you told me that you are getting an error message on the computer? So post the entire error message which you are getting on the computer? Answer the above mentioned question as early as possible.

**Dolsy_bendal** · 02-06-2011

I am suspecting that computer of yours is missing the kernel drivers for the hard drive controller chip set or the thing which are building the module. The Grub is seems to be load the kernel but the kernel would not be able to see the hard drives. Well I am suggesting that you should execute the below mentioned command on the terminal and you should post the output of the below mentioned command.

Code:

lspci –k

**Elijah** · 02-06-2011

Looking at the situation which you have mentioned over here I am suspecting that you might be using the older live CD for the install medium. Current version of the kernels are providing the legacy drivers. However the udev would not make the device nodes for all those drivers. I let you know that the latest version of the kernel drivers are using the libata drivers and the current udev is making the devices like /dev/sd.

**Luis234** · 02-06-2011

Into the grub.conf file should have the following line.

Code:

kernel /boot/kernel-2.6.36-gentoo-r8 root=/dev/sda5

you will be able to use the grubs built into the editor test. You have to press e in order to edit into the RAM copy of the grub.conf. you have to change the root=/dev/hda5 to root=/dev/sda5 then you need to continue the booting process.

**Aleksandra** · 03-06-2011

When you look into the handbook you will have the partition which is called as boot. Also you will have the directory which is called as /boot on your partition of the hard disk. By default the boot partition is mounted over the /boot directory and the entire content of the /boot directory. I am hoping that the thing which you have mentioned over here would be useful to get the requirement of yours.