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userx5
August 10th, 2011, 11:02 PM
After a failed upgrading the computer have kernel panic:



Kernel panic - not syncing: VFS: Unable to mount root fs on unknow-block(8,1)


Can it be recovered in any way?

Thanks.

vgrocha
August 10th, 2011, 11:43 PM
I'm having a similar problem...
I'm using Ubuntu 10.10 Maverick and I get this error when I boot on kernel 2.6.35-30-generic

VFS: Cannot open root device "UUID=..." or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions...
...and then

Kernal panic - not syncing: VFS: Unable to mount root fs on unknown block(0,0)
PID: 1, comm: swapper Not tainted 2.6.35-30-generic...
On the other hand, if i hold SHIFT and boot with the old kernel 2.6.35-28 (on which I'm currently on), everything works fine. I have already tried reinstalling the kernel-image, grub and all combinations of these =)

the grub.cfg entries for the kernels are practically the same.. I don't know what's wrong

grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}

function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
insmod vbe
insmod vga
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Ubuntu, with Linux 2.6.35-28-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
linux /boot/vmlinuz-2.6.35-28-generic root=UUID=2c1c7a3b-d2a7-4bdc-9833-af4af90481ed ro quiet splash
initrd /boot/initrd.img-2.6.35-28-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-28-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
echo 'Loading Linux 2.6.35-28-generic ...'
linux /boot/vmlinuz-2.6.35-28-generic root=UUID=2c1c7a3b-d2a7-4bdc-9833-af4af90481ed ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-28-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
linux /boot/vmlinuz-2.6.35-22-generic root=UUID=2c1c7a3b-d2a7-4bdc-9833-af4af90481ed ro quiet splash
initrd /boot/initrd.img-2.6.35-22-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
echo 'Loading Linux 2.6.35-22-generic ...'
linux /boot/vmlinuz-2.6.35-22-generic root=UUID=2c1c7a3b-d2a7-4bdc-9833-af4af90481ed ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.35-22-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set 2c1c7a3b-d2a7-4bdc-9833-af4af90481ed
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
if [ "x${timeout}" != "x-1" ]; then
if keystatus; then
if keystatus --shift; then
set timeout=-1
else
set timeout=0
fi
else
if sleep --interruptible 3 ; then
set timeout=0
fi
fi
fi
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

userx5
August 11th, 2011, 08:43 AM
Other details are:

I upgraded from Ubuntu 10.10 to 11.04.

Bootloader I think is GRUB2.

I was updating my system through command-line.

When booting appears the messages:



Loading /casper/vmlinuz
Loading /casper/initrd.lz...ready
Kernel panic - not syncing: VFS: Unable to mount root fs on unknow-block(8,1)
Pid: 1, comm: swapper Not tainted 2.6.35-22-generic #33-Ubuntu
Call Trace:
(and another 10 lines more of messages, after that it stops)