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Thread: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

  1. #1
    Join Date
    Nov 2009
    Beans
    2

    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    Hello!

    Sorry, if my English isn't very proper.
    I use Ubuntu 9.10 and Windows 7 together. I installed Ubuntu via Wubi.
    I had been succesfuly using this configuration for a month untill yesterday. Yesterday I made latest updates suggested by Update Manager to my Ubuntu. After that my Ubuntu crashed.
    Now after turning on my laptop I got this error:

    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block (8,5)

    Windows 7 always boots succesfuly.
    Ubuntu doesn't boot even in recovery mode.

    Could you please help me to resolve this problem?

    Thanks in advance.

  2. #2
    Join Date
    Nov 2009
    Location
    Malang, Indonesia
    Beans
    2
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    it's happens to me too.. can anyone help us?

    My system:
    -Windows XP, using ubuntu 9.10

  3. #3
    Join Date
    Nov 2009
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    1

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    Same here. -VFS: Unable to mount root fs on unknown-block (8,1)-

    I'm running Vista and Karmic Koala

    Thanks for your help

  4. #4
    Join Date
    Nov 2009
    Beans
    1
    Distro
    Ubuntu 9.10 Karmic Koala

    Unhappy Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    I installed Ubuntu 9.10 using wubi on my WindowsXP machine. It worked just fine until today. Now i have the same problem you all have. Here's a printout:
    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)

    Now my project is locked in ubuntu and i can't reach it

  5. #5
    Join Date
    Feb 2009
    Location
    Cheshire UK
    Beans
    9
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Lightbulb Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    Quote Originally Posted by jesamjasam View Post
    I installed Ubuntu 9.10 using wubi on my WindowsXP machine. It worked just fine until today. Now i have the same problem you all have. Here's a printout:
    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)

    Now my project is locked in ubuntu and i can't reach it
    I am running 9.10 latest release and after the latest updates the following errors occured:
    Ubuntu would not boot from grub, froze on first splash screen
    Ubuntu would boot from recovery mode, screen cycled unreadable messages at speed.Received a kernel panic message at some point.
    After trying various suggestions, I got it back by:
    Select recovery option (second line in grub)
    Wait for screen message "cycling" to start
    Press [CTRL+ALT+F2]
    This took me to a login screen
    Enter Ubuntu username & password
    Got to login prompt for Ubnutu installation(Terminal)
    Run [sudo fdisk -l]
    All seemed ok here as before boot problem started
    Type [exit] to close terminal
    Reboot to Ubuntu login as normal
    I tried other CRTL_ALT options as suggested but F2 seemed to work this time?
    Not sure why this happened, and if it was just a fluke I got it back
    Will do some research.
    My system is not under wubi tho and is dual boot with xp pro.

  6. #6
    Join Date
    Jun 2007
    Location
    Sheffield, UK
    Beans
    33
    Distro
    Ubuntu 14.10 Utopic Unicorn

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    Same problem, same error message, with a freshly installed version of 9.10 installed "within windows" on an XP Home laptop.

    The problem only started after I updated to the latest kernel.

    I can still boot into Karmic using the previous version of the kernel.

    Any thoughts?
    Change is inevitable, except from a vending machine ...

  7. #7
    Join Date
    Nov 2007
    Beans
    9

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    I did the recommended updates last night, and it cannot mount the drive.
    I am using a SATA hard drive, which looks like a SCSI. The kernel seems to be looking for a RAID drive, but this hardware has been working fine until this update.
    The generic version of this kernel update (2.6.31-15-generic) is fine, but the 386 version (2.6.31-15-386) won't run.
    I am running the generic release right now, the previous 9.10 installation.
    I guess they left something vital out of the kernel.

  8. #8
    Join Date
    Oct 2009
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    7

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    same problem here ...

    -Windows XP
    -ubuntu 9.10

  9. #9
    Join Date
    Oct 2009
    Beans
    7

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    Quote Originally Posted by mfratus2001 View Post
    I did the recommended updates last night, and it cannot mount the drive.
    I am using a SATA hard drive, which looks like a SCSI. The kernel seems to be looking for a RAID drive, but this hardware has been working fine until this update.
    The generic version of this kernel update (2.6.31-15-generic) is fine, but the 386 version (2.6.31-15-386) won't run.
    I am running the generic release right now, the previous 9.10 installation.
    I guess they left something vital out of the kernel.
    How should i use previous version of Kernel ? and where should i find its version ?

  10. #10
    Join Date
    Dec 2009
    Beans
    3

    Re: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block

    Hi everyone,

    I'm absolutely new to Linux, leave aside Ubuntu. Having installed Ubuntu Karmic Koala just a few days ago, using Wubi, I have been extremely impressed with this O/S.

    Getting to the point, I ran into this problem yesterday and I really couldn't understand a word everyone was saying about fixing this issue. My kernel had been updated to 2.6.31-15 and last morning, my machine wouldn't boot.

    I noticed that I was able to boot into 2.6.31-14, so I worked on it for a while, trying to find a 'simple' solution before I went on learning all the technical stuff.

    Anyhow, the fix:

    1) Go to System > Administration > Synaptic Package Manager
    2) Put in a search for linux-image
    3) Locate the package "linux-image-2.6.31-15-generic"
    4) Select the check-box next to this package and choose "Mark for Reinstallation"
    5) Apply this changes
    6) Reboot your machine

    (For me) problem solved.

    I hope it works for all of you as well.

    Thanks,

    J.

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