Help for repair dual boot

Have buy an Nvme SSD.
My bios is configured :

  • No Fast boot
  • No Secure boot
  • CSM (EFI and legacy)
    All partition in GTP.

I’ve made a copy of all windows partition.
I can access to my windows partition with uefi/bios (windows boot loader).
and grub load EOS when I boot on the disk in uefi/bios.
I cannot see the windows partition doing

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

despite I’ve do a frech install.
May I reinstall windows ? and EOS after. How to repair grub-loader ? Do you think tools like rEFIned help me in this case ?
Tell me what information do you need.

Best regards

Did you set GRUB_DISABLE_OS_PROBER=false in /etc/default/grub?


In your EnOS, open a terminal and check the installation mode:

test -d /sys/firmware/efi && echo UEFI || echo BIOS

If UEFI, please proceed as per @dalto’s post.

If BIOS and if this is a new install, backup your personal data and reinstall in UEFI mode. Make sure that you disable CSM in your firmware settings. That is, you should only have UEFI boot mode enabled.


Unless Windows is on BIOS/Legacy and EnOS in UEFI :stuck_out_tongue_winking_eye:

The best way to know what’s happening is to get more (apart from what’s already asked) real info with

sudo fdisk -l
1 Like

I’ve do this : was in the Bios case.
I’ve reinstall EOS in UEFI Mode, keeping my /home
Thank you for your help : dual boot is restaured.

Best regards.


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