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I've been using Ubuntu 16 and yesterday it was taking too much time to boot. So I forced restart it by pressing and holding the power button. Later when I tried to boot it,it's "Unable to mount root fs on unknown-block(0,0) How can I fix this without losing my data?

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Videonauth
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Himanshu Gupta
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1 Answers1

1

Start with a live USB/CD, choose 'Try Ubuntu' and open a terminal (Ctrl+Alt+T):

  1. List your partitions with sudo fdisk -l and choose the right one to mount:

    sudo mount /dev/sdaX /mnt

    Where sdX is your Ubuntu installation on your HDD. If you have an EFI boot system you need to mount your EFI partition as well.

    sudo mount /dev/sdY /mnt/boot/efi

    Where sdY is your EFI partition.

  2. Now mount the following and chroot into your install

    # in case you need to reinstall the kernel (you will need LAN connection for this)
sudo cp /mnt/etc/hosts /mnt/etc/hosts.old
sudo cp /etc/hosts /mnt/etc/hosts
sudo cp /etc/resolv.conf /mnt/etc/resolv.conf

# the below is always needed
sudo mount -o bind /dev /mnt/dev
sudo mount -o bind /dev/pts /mnt/dev/pts
sudo mount -t sysfs /sys /mnt/sys
sudo mount -t proc /proc /mnt/proc
sudo chroot /mnt

  3. Create a update-initramfs and update-grub. Make sure you put the right version number into the next line, you can find this by dpkg --list | grep linux-image.

    update-initramfs -u -k 4.4.0-101-generic
update-grub

    If that step fails for whatever reason you might want to reinstall that kernel with:

     apt install --reinstall linux-image-4.4.0-101-generic linux-image-extra-4.4.0-101-generic linux-firmware

  4. Unmount and reboot your system.

    exit
sudo umount /mnt/dev/pts
sudo umount /dev /mnt/dev
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/boot/efi
sudo umount /mnt
reboot
Videonauth
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