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2.4.x to 2.6.y kernel



Folks - I'm sure others have come across this but I can't see the
solution in the archives, so all help welcomed.

On my box (2*Xeon, SATA HD), I've been running 2.4.27-1-686-smp and
thought it's about time to move to 2.6 so I did a 
 sudo apt-get install kernel-image-2.6.8-2-686-smp
and rebooted but now get a kernel panic with this kernel, along the
lines of 

   pivot_root: No such file or directory
   /sbin/init: 432: cannot open dev/console: No such file
   Kernel panic - not syncing: Attempt to kill init!

Any ideas? My grub menu.lst (below) uses initrd and I'm wondering if
that's part of the problem. I also note that
$ ls -lt /initrd*
lrwxrwxrwx  1 root root   31 Jul 18 10:54 /initrd.img ->
boot/initrd.img-2.6.8-2-686-smp
lrwxrwxrwx  1 root root   32 Nov 12  2004 /initrd.img.old ->
boot/initrd.img-2.4.27-1-686-smp

which doesn't quite seem to match up the grub/menu.lst:

# menu.lst - See: grub(8), info grub, update-grub(8)
#            grub-install(8), grub-floppy(8),
#            grub-md5-crypt, /usr/share/doc/grub
#            and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from
0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default
entry
# is the entry saved with the command 'savedefault'.           
default		0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the
default entry
# (normally the first entry defined).
timeout		5

# Pretty colours
color cyan/blue white/blue

## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive
editing
# control (menu entry editor and command-line)  and entries protected by
the
# command 'lock'
# e.g. password topsecret
#      password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret
password --md5 $1$qQ.rd0$wiHMnIUNnhVMeuxGAKXzp/

#
# examples
#
# title		Windows 95/98/NT/2000
# root		(hd0,0)
# makeactive
# chainloader	+1
#
# title		Linux
# root		(hd0,1)
# kernel	/vmlinuz root=/dev/hda2 ro
#

#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

## DO NOT UNCOMMENT THEM, Just edit them to your needs

## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specifiv kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
# kopt=root=/dev/hde2 ro

## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,7)

## should update-grub create alternative automagic boot options
## e.g. alternative=true
##      alternative=false
# alternative=true

## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
##      lockalternative=false
# lockalternative=false

## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
##      altoptions=(recovery mode) single
# altoptions=(recovery mode) single

## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
##      howmany=7
# howmany=all

## should update-grub create memtest86 boot option
## e.g. memtest86=true
##      memtest86=false
# memtest86=true

## ## End Default Options ##

title		Debian GNU/Linux, kernel 2.6.8-2-686-smp 
root		(hd0,7)
kernel		/vmlinuz-2.6.8-2-686-smp root=/dev/hde2 ro 
initrd		/initrd.img-2.6.8-2-686-smp
savedefault
boot

title		Debian GNU/Linux, kernel 2.6.8-2-686-smp (recovery mode)
root		(hd0,7)
kernel		/vmlinuz-2.6.8-2-686-smp root=/dev/hde2 ro single
initrd		/initrd.img-2.6.8-2-686-smp
savedefault
boot

title		Debian GNU/Linux, kernel 2.4.27-1-686-smp 
root		(hd0,7)
kernel		/vmlinuz-2.4.27-1-686-smp root=/dev/hde2 ro 
initrd		/initrd.img-2.4.27-1-686-smp
savedefault
boot

title		Debian GNU/Linux, kernel 2.4.27-1-686-smp (recovery mode)
root		(hd0,7)
kernel		/vmlinuz-2.4.27-1-686-smp root=/dev/hde2 ro single
initrd		/initrd.img-2.4.27-1-686-smp
savedefault
boot

title		Debian GNU/Linux, kernel 2.4.27-1-386 
root		(hd0,7)
kernel		/vmlinuz-2.4.27-1-386 root=/dev/hde2 ro 
initrd		/initrd.img-2.4.27-1-386
savedefault
boot

title		Debian GNU/Linux, kernel 2.4.27-1-386 (recovery mode)
root		(hd0,7)
kernel		/vmlinuz-2.4.27-1-386 root=/dev/hde2 ro single
initrd		/initrd.img-2.4.27-1-386
savedefault
boot

### END DEBIAN AUTOMAGIC KERNELS LIST

# This is a divider, added to separate the menu items below from the
Debian
# ones.
title		Other operating systems:
root


# This entry automatically added by the Debian installer for a non-linux
OS
# on /dev/hde1
title		Windows NT/2000/XP
root		(hd0,0)
savedefault
makeactive
chainloader	+1





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