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Old 12-24-2010, 10:41 AM   #1
chaitanyajun12
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Smile How to edit grub.cfg after kernel compilation -reg.


hi all,

I am compiling a new kernel. I have successfully compiled it, but can anyone tell me how to modify grub.cfg. I am using ubuntu 10.10.

Can I use 'update-grub' ?

I tried using that and even its updating the grub with new kernel. But after I boot the new kernel its showing

-----------------------------------------------
The disk for / is not ready or does not exist

#and some statements# M for recovery ...
-----------------------------------------------

Is there any problem with kernel compilation and why is that coming ?

with kind regards,
Chaitanya.
 
Old 12-24-2010, 10:53 AM   #2
Larry Webb
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Here is a good link to a grub2 tutorial that tells you how to change everything including splash screens.

grub2

Oh and also simple enough I understood most of it.

Sorry just reread the rest of your post and it appears you may have another problem. Do you have a live cd? If so from terminal

sudo grub-install /dev/sdX

and if that does not work

parted -l
and post results

Last edited by Larry Webb; 12-24-2010 at 10:59 AM.
 
Old 12-24-2010, 10:56 AM   #3
EDDY1
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os-prober has to be executed

before update-grub
 
Old 12-24-2010, 11:17 AM   #4
chaitanyajun12
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yes..my grub updated correctly and the entry is also being shown up. but the problem which I mentioned earlier, after booting with that kernel, I am getting a screen

---------------------------
ubuntu 10.10

The disk drive for / is not ready yet or not present

Continue to wait; or press S to skip mounting or M for manual recovery.
----------------------------

from that stage its not moving at all. I tried 'M' but it ended up entering password and to the command line.

I am having two linux installations in my system 10.04 and 10.10 separately. Is the problem because of that ?

Chaitanya.
 
Old 12-24-2010, 12:04 PM   #5
EDDY1
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Do you have option of booting old kernel?
 
Old 12-24-2010, 12:08 PM   #6
Larry Webb
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If should not be a problem if the two are on separate partitions.

Use a ubuntu live and from terminal post the results of command

sudo parted -l

and tell me which partitions ubuntu 10.4 and 10.10 are on.
 
Old 12-24-2010, 12:46 PM   #7
chaitanyajun12
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@eddy
through the grub i am selecting the new kernel.

@larry

obviously those are on seperate partitions. I am sending you the details of the command mentioned.

Quote:
# sudo parted -l

Model: ATA ST3250310AS (scsi)
Disk /dev/sda: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32.3kB 21.0GB 21.0GB primary fat32 boot, lba
2 21.0GB 126GB 105GB extended lba
11 21.0GB 21.8GB 822MB logical ext3
10 27.4GB 37.0GB 9640MB logical ext2
8 37.0GB 52.0GB 15.0GB logical ext3
9 52.0GB 52.4GB 387MB logical linux-swap(v1)
5 52.4GB 83.9GB 31.5GB logical fat32
6 83.9GB 115GB 31.5GB logical ntfs
7 115GB 126GB 10.5GB logical ext3
3 126GB 157GB 31.5GB primary ntfs
4 157GB 250GB 92.7GB primary ntfs
I even doubt if there is any problem with my compilation. Initially I did

1. make defconfig (selecting a default configuration)
2. make
3. make modules_install
4. make install
5. update-grub

Later i just restarted the system. Is this correct?
 
Old 12-24-2010, 04:50 PM   #8
Larry Webb
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Is your ubuntu on a live cd, if it is boot the live cd and try the command from terminal

sudo grub-install /dev/sda

I am not experienced with scsi hds. If it does not install it should give errors.
 
Old 12-25-2010, 01:46 AM   #9
chaitanyajun12
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Since i have got only one partition on linux /dev/sda1 ..
so i tried installing from that.

$ sudo grub-install /dev/sda1

/usr/sbin/grub-probe: error: cannot find a device for /boot/grub (is /dev mounted?).

----------------------------
Chaitanya.
 
Old 12-25-2010, 03:01 AM   #10
chaitanyajun12
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I have installed the grub2 following this tutorial

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

and now i am getting the grub. but when I am trying to boot the new kernel,

its showing some mount errors followed by

Quote:
Target file system doesn't have /sbin/init
No init found. Try passing init = bootarg

Busy box V1.13.3
(initramfs)
when i am trying to exit using 'exit' command ..
its showing errors.
Quote:
/init: line 271: can't open /root/dev/console
[110.785090] Kernel panic - not syncing: after to kill init
[110.782930] Call trace:
...
...
.
These errors are coming when i trying to boot new kernel.

please help me out with these errors.

Chaitanya.
 
  


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