Re: grub not working after kernel update

grub not working after kernel update

[Joe Klemmer]

On Thu, 3 Jul 2008, lee wrote:
> > > I just upgraded my laptop using yum. Upgrade included a new kernel, 
> > > after upgrade finished I rebooted. Now all I get is GRUB on my 
> > > screen. I booted with rescue disk and can see nothing wrong with 
> > > grub. New kernel is 2.6.26.9-76.fc9.i686.
> >
> > This happened to me recently. I booted from a live cd and reinstalled 
> > grub. After that the system booted up. If you don't know how do it let 
> > us knows to get step by step instructions. EJ
>
> Thanks for all the help. Used rescue disk and reinstalled grub. Works 
> fine now.

Heh, I wish I'd seen this earlier.  The same thing happened to me 
and now the box is feeling less than cooperative.  Could someone please 
post the step by step instructions for an oldtimer?  I'd google but I'm 
having to use a public box to access the 'Net at the moment.  If it's not 
to much trouble could you CC to [e-mail] please?  It's bood 
to have a fallback.

Joe

grub not working after kernel update

-------------- Original message ----------------------
From: Joe Klemmer
> On Thu, 3 Jul 2008, lee wrote:
> > > > I just upgraded my laptop using yum. Upgrade included a new kernel, 
> > > > after upgrade finished I rebooted. Now all I get is GRUB on my 
> > > > screen. I booted with rescue disk and can see nothing wrong with 
> > > > grub. New kernel is 2.6.26.9-76.fc9.i686.
> > >
> > > This happened to me recently. I booted from a live cd and reinstalled 
> > > grub. After that the system booted up. If you don't know how do it let 
> > > us knows to get step by step instructions. EJ
> >
> > Thanks for all the help. Used rescue disk and reinstalled grub. Works 
> > fine now.
>
> Heh, I wish I'd seen this earlier.  The same thing happened to me 
> and now the box is feeling less than cooperative.  Could someone please 
> post the step by step instructions for an oldtimer?  I'd google but I'm 
> having to use a public box to access the 'Net at the moment.  If it's not 
> to much trouble could you CC to [e-mail] please?  It's bood 
> to have a fallback.
>
> Joe

Get the live CD or the Fedora 9 Installer DVD.
Make sure your computer BIOS is configured to start from the cd/dvd, this is in case it doesn't boot up from the cd/dvd.
> From the CD open the terminal. From the Installer DVD select Rescue Mode.
> From the CD terminal become root by doing: su -

There's no password.
> From the DVD no need, you fall into a terminal.

1-Let's find your boot partition

fdisk -l

You'll get something like this among other things.
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          25      200781   83  Linux
/dev/sda2              26        4866    38885332+  8e  Linux LVM

See the asterisk? That's your boot partition, sda1. So now you know.

2- Let's restart the grub boot loader

type grub and press enter. You'll get this.

# grub
Probing devices to guess BIOS drives. This may take a long time.

GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

[ Minimal BASH-like line editing is supported.  For the first word, TAB
   lists possible command completions.  Anywhere else TAB lists the possible
   completions of a device/filename.]
grub>

3- At the grub prompt let's select the partition with the command root (hd0,0). Zero means the first one.
This is the output.

grub> root (hd0,0)
root (hd0,0)
 Filesystem type is ext2fs, partition type 0x83

If your boot partition is sda2 then the command would be: root (hd0,0). For sdb1: root (hd1,0). For sdb2: root (hd1,1). Got it?

4- Once the partition is selected, reinstall grub with this command.

setup (hd0)

Note. If your partition was sdb1 then setup (hd1)

5- Now enter quit at the grub prompt and reboot.

If you have any problems, post here the errors as well as the output of fdisk -l

Hope that helps.
EJ