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I am comparatively new to Ubuntu.I have a laptop with Windows10 installed on a 1TB SATA SSD.Today,i added another 240GB NVMe SSD & Installed Ubuntu 22.04 LTS. I can successfully dual boot & change the OS from BIOS.But unlike my Desktop(Where I have Ubuntu & Win7 on two different partitions of a same drive) where the GRUB appears & ask for the Ubuntu & Windows boot manager! When installing Ubuntu on the NVMe,i totally disconnected the Windows drive to play safe.Somewhere I read that OS-Prober will automatically detect the OS & shows on the GRUB but it's not happening! What should i do to get the dual boot menu on the GRUB?

Thanks in advance!!

S.Das
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    Do you want to be able to boot Windows when the second disk has been removed (without going into UEFI settings/BIOS)? If not, did you try to simply run update-grub (that should get the Windows grub option on the second disk's grub menu)? If that didn't work, check to see if the /etc/grub.d/30_os-prober has been disabled. – ubfan1 Feb 16 '24 at 16:30
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    Thanks a lot for your promt response..... What I did was:
    1. sudo nano /etc/default/grub
    2. Added This line GRUB_DISABLE_OS_PROBER=false
    3. sudo os-prober
    4. sudo update grub

    That added the entry of Windows Boot Manager to the GRUB menu & now i am able to see the dual boot option from GRUB.

     – S.Das Feb 16 '24 at 17:17
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  • Does this answer your question? Unable to boot into Windows after installing Ubuntu, how to fix? – karel Feb 26 '24 at 15:02

1 Answers1

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I found a solution:

Run these commands in sequence

  1. sudo nano /etc/default/grub
  2. Added This line GRUB_DISABLE_OS_PROBER=false if not present.Or uncomment,if line present
  3. sudo os-prober
  4. sudo update grub
  5. sudo reboot -h now

That added the entry of Windows Boot Manager to the GRUB menu.Now after reboot,windows boot manager will appear as dual boot option in GRUB

S.Das
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