(Solved) Ubuntu not detecting Windows 10 Dual Boot

Ubuntu installation wizard will automatically detect your Windows if you are installing in dual boot, but in some cases, if you encounter "This computer currently has no detected operating system" warning, then this guide will help you to resolve this issue.



Close the Ubuntu installation wizard, reboot it into your Windows and follow the below step by step instructions to clean up your Windows 10 errors first.

From Windows 10,  Right-click on Start > File Explorer and find the Windows partition usually “C:\” volume.


Right-click on the C:\ volume, click Properties.


Click Tools then click the Check button to fix errors.


This will scan the C:\ drive for errors, and fix them automatically.

When the error checking process finished, open up the Windows PowerShell(Admin) from the start menu.


When the prompt opens up on the screen, saying, “Do you want to allow this app to make changes to your device, click Yes

Type the chkdsk C: /F on the PowerShell to scan and fix the errors on the next reboot.


Press the Y key on the keyboard to say yes to check the next time the system restarts. Reboot your system manually and let the chkdsk command complete its process.

When the chkdsk process finished, boot into Windows 10 and then, Shutdown from the Start menu to turn it off safely.

Next, boot with Ubuntu installation media and see if the Ubuntu installation wizard detects Windows 10 as shown in the below screenshot.


If it detects and gives you the option to install Ubuntu alongside Windows 10 then you are good to go with the wizard following on-screen instructions to complete the rest of the Ubuntu installation.


For instance, if it doesn't detect your Windows 10 after completing the Ubuntu installation in the dual boot then boot with the Ubuntu installation media again. When you see the below screen click Try Ubuntu.


When your system reaches to Ubuntu graphical desktop, open a terminal session by pressing the key combination of Ctrl + Alt + T or Ctrl + Shift + T on the keyboard.


Type the lsblk command to detect what your Windows PC’s drive label is, as well as the partition names. For example, it can be “/dev/sdb”, and the partitions you’ll work with are “/dev/sdb1”, “/dev/sdb2”, and /dev/sdb3”.

Run the fsck tool on each of your Windows partitions to clean out the bad sectors/bits on the hard drive. Make sure you replace each instance of “/dev/sdb” with your actual Windows partition names.
sudo fsck -y /dev/sdb1
sudo fsck -y /dev/sdb2 sudo fsck -y /dev/sdb3
Next, install the os-prober package on Ubuntu using the apt command:
sudo apt -y install os-prober
Next, type the below command to manually update your bootloader:
sudo update-grub
This will automatically detect and add Windows 10 in the grub bootloader.

Reboot your system and take a look at the Grub bootloader. If the above steps were successful, Ubuntu will show you Windows 10 as a boot option.


Wrapping up

I hope this guide was helpful to set up your Ubuntu alongside Windows in a dual boot environment.

8 comments:

  1. swordz@swordz-Aspire-E5-411 ~ $ sudo update-grub
    Generating grub configuration file ...
    Found linux image: /boot/vmlinuz-4.4.0-187-generic
    Found initrd image: /boot/initrd.img-4.4.0-187-generic
    Found linux image: /boot/vmlinuz-4.4.0-21-generic
    Found initrd image: /boot/initrd.img-4.4.0-21-generic
    Found memtest86+ image: /boot/memtest86+.elf
    Found memtest86+ image: /boot/memtest86+.bin
    done

    ReplyDelete
  2. I get this error, please help me:

    ubuntu@ubuntu:~$ sudo update-grub
    /usr/sbin/grub-probe: error: no se pudo obtener la ruta canĂ³nica de «/cow».

    ReplyDelete
    Replies
    1. I don’t understand language other than english. If you need help, you have to post or translate your query in english please.

      Delete
    2. Sorry, I just copied/pasted. This is the error:

      ubuntu@ubuntu:~$ sudo update-grub
      /usr/sbin/grub-probe: error: failed to get canonical path of «/cow».

      Delete
    3. Follow these steps:

      Boot into a Live Ubuntu session.
      Mount the / partition of your installed OS to /mnt

      sudo mount /dev/sda6 /mnt
      Set up a chroot environment:

      sudo chroot /mnt
      You are now in a "fake" Linux install that treats /mnt as /. This means that all the files necessary for GRUB are in /boot where the system expects them to be and you can install GRUB just as if you were actually running your installed system:

      sudo update-grub
      sudo grub-install /dev/sda

      Now reboot and you should see the GRUB menu appear normally.

      Delete
    4. I could mount the / partition of my installed OS (Windows10) but it doesn't let me set up a chroor enviroment:

      ubuntu@ubuntu:~$ sudo chroot /mnt
      chroot: failed to run command ‘/bin/bash’: No such file or directory

      Delete
    5. Find your drive that's supposed to boot with:

      mount

      Or

      parted -l

      Or

      fdisk /dev/sda

      And type p to list the partitions, look for type 83.

      then try mount it

      mkdir /mnt

      mount /dev/sda1 /mnt

      cd /mnt

      ls -l

      Is this your drive? Cool!

      grub-install --recheck --root-directory=/mnt /dev/sda

      (Or whichever /dev drive your root is, with it's mounted path)

      grub-install --recheck --root-directory=/mnt /dev/sda -f

      grub-mkconfig -o /mnt/boot/grub/grub.cfg

      Delete
  3. Thanks for info Muhammad and Ali. But i had this error
    fdisk: cannot open /dev/sda1: Permission denied

    ReplyDelete

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