kernel panic after fresh install

[Bill Heagy]

I had that problem after I upgraded from 10.04.  I could run with the 
old kernels, so I lived with it for awhile, but then I just uninstalled 
the new kernel image and reinstalled it, and everything has been fine 
since then.

Rajinder Yadav wrote:
> Guys I am having a problem after a fresh installed of Xubuntu 10.10 on
> my old server. I get a kernel panic, the 1st line of the message says:
>
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> Here is a copy of the boot info script output, can someone tell me how I
> might be able to get my system to bootup? I am able to boot into my
> system and mount my root / filesystem.
>
>
> Boot Info Script 0.55 dated February 15th, 2010
>
> ============================= Boot Info Summary:
> ==============================
>
> => Grub 2 is installed in the MBR of /dev/sda and looks on the same
> drive in
> partition #1 for (,msdos1)/boot/grub.
>
> sda1:
> _________________________________________________________________________
>
> File system: ext4
> Boot sector type: -
> Boot sector info:
> Operating System: Ubuntu 10.10
> Boot files/dirs: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
>
> sda2:
> _________________________________________________________________________
>
> File system: Extended Partition
> Boot sector type: Unknown
> Boot sector info:
>
> sda5:
> _________________________________________________________________________
>
> File system: swap
> Boot sector type: -
> Boot sector info:
>
> =========================== Drive/Partition Info:
> =============================
>
> Drive: sda ___________________
> _____________________________________________________
>
> Disk /dev/sda: 30.8 GB, 30758289408 bytes
> 255 heads, 63 sectors/track, 3739 cylinders, total 60074784 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
>
> Partition Boot Start End Size Id System
>
> /dev/sda1 * 2,048 59,887,615 59,885,568 83 Linux
> /dev/sda2 59,889,662 60,073,983 184,322 5 Extended
> /dev/sda5 59,889,664 60,073,983 184,320 82 Linux swap / Solaris
>
>
> blkid -c /dev/null:
> ____________________________________________________________
>
> Device UUID TYPE LABEL
>
> /dev/sda1 54f645ad-c340-4618-9657-39ceade647a7 ext4 root
> /dev/sda2: PTTYPE="dos"
> /dev/sda5 8a9cba64-836f-4bff-abc0-46d53200658d swap
> /dev/sda: PTTYPE="dos"
>
> ============================ "mount | grep ^/dev output:
> ===========================
>
> Device Mount_Point Type Options
>
> /dev/sda1 / ext4 (rw,relatime,errors=remount-ro,barrier=1,data=ordered)
> /dev/scd0 /media/cdrom iso9660 (ro,relatime)
>
>
> =========================== sda1/boot/grub/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 "${boot_once}" ]; then
> save_env recordfail; fi; fi
> }
>
> function load_video {
> insmod vbe
> insmod vga
> }
>
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set 54f645ad-c340-4618-9657-39ceade647a7
> if loadfont /usr/share/grub/unicode.pf2 ; then
> set gfxmode=640x480
> load_video
> insmod gfxterm
> fi
> terminal_output gfxterm
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set 54f645ad-c340-4618-9657-39ceade647a7
> set locale_dir=($root)/boot/grub/locale
> set lang=C.UTF-8
> insmod gettext
> if [ "${recordfail}" = 1 ]; then
> set timeout=-1
> else
> set timeout=10
> fi
> ### END /etc/grub.d/00_header ###
>
> ### BEGIN /etc/grub.d/05_debian_theme ###
> set menu_color_normal=white/black
> set menu_color_highlight=black/light-gray
> ### END /etc/grub.d/05_debian_theme ###
>
> ### BEGIN /etc/grub.d/10_linux ###
> menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class
> gnu-linux --class gnu --class os {
> recordfail
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set 54f645ad-c340-4618-9657-39ceade647a7
> linux /boot/vmlinuz-2.6.35-22-generic
> root=UUID=54f645ad-c340-4618-9657-39ceade647a7 ro quiet splash
> initrd /boot/initrd.img-2.6.35-22-generic
> }
> menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class
> ubuntu --class gnu-linux --class gnu --class os {
> recordfail
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set 54f645ad-c340-4618-9657-39ceade647a7
> echo 'Loading Linux 2.6.35-22-generic ...'
> linux /boot/vmlinuz-2.6.35-22-generic
> root=UUID=54f645ad-c340-4618-9657-39ceade647a7 ro single
> echo 'Loading initial ramdisk ...'
> initrd /boot/initrd.img-2.6.35-22-generic
> }
> ### END /etc/grub.d/10_linux ###
>
> ### BEGIN /etc/grub.d/20_linux_xen ###
> ### END /etc/grub.d/20_linux_xen ###
>
> ### BEGIN /etc/grub.d/20_memtest86+ ###
> menuentry "Memory test (memtest86+)" {
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set 54f645ad-c340-4618-9657-39ceade647a7
> linux16 /boot/memtest86+.bin
> }
> menuentry "Memory test (memtest86+, serial console 115200)" {
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set 54f645ad-c340-4618-9657-39ceade647a7
> linux16 /boot/memtest86+.bin console=ttyS0,115200n8
> }
> ### END /etc/grub.d/20_memtest86+ ###
>
> ### BEGIN /etc/grub.d/30_os-prober ###
> if [ "x${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 $prefix/custom.cfg;
> fi
> ### END /etc/grub.d/41_custom ###
>
> =============================== sda1/etc/fstab:
> ===============================
>
> # /etc/fstab: static file system information.
> #
> # Use 'blkid -o value -s UUID' to print the universally unique identifier
> # for a device; this may be used with UUID= as a more robust way to name
> # devices that works even if disks are added and removed. See fstab(5).
> #
> # <file system> <mount point> <type> <options> <dump> <pass>
> proc /proc proc nodev,noexec,nosuid 0 0
> # / was on /dev/sda1 during installation
> UUID=54f645ad-c340-4618-9657-39ceade647a7 / ext4 errors=remount-ro 0 1
> # swap was on /dev/sda5 during installation
> UUID=8a9cba64-836f-4bff-abc0-46d53200658d none swap sw 0 0
>
> =================== sda1: Location of files loaded by Grub:
> ===================
>
>
> 10.8GB: boot/grub/core.img
> 10.8GB: boot/grub/grub.cfg
> .4GB: boot/initrd.img-2.6.35-22-generic
> 10.8GB: boot/vmlinuz-2.6.35-22-generic
> .4GB: initrd.img
> 10.8GB: vmlinuz
> =========================== Unknown MBRs/Boot Sectors/etc
> =======================
>
> Unknown BootLoader on sda2
>
> 00000000 a4 ff 8b 54 24 54 89 14 24 ff d0 84 c0 74 b8 8b |...T$T..$....t..|
> 00000010 4c 24 78 8b 01 89 0c 24 ff 90 c8 00 00 00 8b 4c |L$x....$.......L|
> 00000020 24 70 8b 11 8b 4c 24 74 89 44 24 0c 8b 44 24 48 |$p...L$t.D$..D$H|
> 00000030 89 4c 24 04 89 44 24 08 8b 44 24 70 89 04 24 ff |.L$..D$..D$p..$.|
> 00000040 92 94 00 00 00 83 c4 5c 5b 5e 5f 5d c3 8b 54 24 |.......\[^_]..T$|
> 00000050 70 8b 02 89 14 24 ff 90 90 00 00 00 89 44 24 58 |p....$.......D$X|
> 00000060 e9 f9 fd ff ff 90 8d 76 00 8d bc 27 00 00 00 00 |.......v...'....|
> 00000070 83 ec 4c 89 74 24 40 8b 74 24 54 89 5c 24 3c 89 |..L.t$@.t$T.\$<.|
> 00000080 7c 24 44 89 6c 24 48 8b 06 e8 39 a9 a5 ff 81 c3 ||$D.l$H...9.....|
> 00000090 8e 39 74 00 89 34 24 ff 90 d8 05 00 00 89 44 24 |.9t..4$.......D$|
> 000000a0 34 8b 06 89 34 24 ff 90 e0 05 00 00 89 44 24 38 |4...4$.......D$8|
> 000000b0 8b 06 89 34 24 ff 90 e8 05 00 00 89 c5 8b 06 89 |...4$...........|
> 000000c0 34 24 ff 90 f0 05 00 00 89 c7 8b 06 89 34 24 ff |4$...........4$.|
> 000000d0 90 d0 05 00 00 89 7c 24 1c 89 6c 24 18 89 34 24 |......|$..l$..4$|
> 000000e0 89 44 24 2c 8b 44 24 6c 89 44 24 28 8b 44 24 68 |.D$,.D$l.D$(.D$h|
> 000000f0 89 44 24 24 8b 44 24 64 89 44 24 20 8b 44 24 38 |.D$$.D$d.D$ .D$8|
> 00000100 89 44 24 14 8b 44 24 34 89 44 24 10 8b 44 24 60 |.D$..D$4.D$..D$`|
> 00000110 89 44 24 0c 8b 44 24 5c 89 44 24 08 8b 44 24 58 |.D$..D$\.D$..D$X|
> 00000120 89 44 24 04 e8 7b 1c a5 ff 8b 5c 24 3c 8b 74 24 |.D$..{....\$<.t$|
> 00000130 40 8b 7c 24 44 8b 6c 24 48 83 c4 4c c3 90 66 90 |@.|$D.l$H..L..f.|
> 00000140 55 57 56 53 e8 7e a8 a5 ff 81 c3 d3 38 74 00 83 |UWVS.~......8t..|
> 00000150 ec 5c 8b 83 c0 c2 ff ff 89 04 24 e8 74 91 a3 ff |.\........$.t...|
> 00000160 8b b3 40 5f ff ff 89 34 24 e8 46 f0 a3 ff 89 44 |.. at _...4$.F....D|
> 00000170 24 3c 89 04 24 e8 ca 83 a5 ff 89 34 24 e8 32 f0 |$<..$......4$.2.|
> 00000180 a3 ff 89 c5 89 04 24 e8 b8 83 a5 ff 8b 54 24 70 |......$......T$p|
> 00000190 8b 02 89 14 24 ff 90 bc 03 00 00 89 34 24 89 44 |....$.......4$.D|
> 000001a0 24 58 e8 0d f0 a3 ff 89 44 24 38 89 04 24 e8 91 |$X......D$8..$..|
> 000001b0 83 a5 ff 8b 4c 24 70 8b 01 89 0c 24 ff 50 00 fe |....L$p....$.P..|
> 000001c0 ff ff 82 fe ff ff 02 00 00 00 00 d0 02 00 00 00 |................|
> 000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
> *
> 000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
> 00000200
>
>
>

-- 
Bill Heagy
--
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