[SOLVED] problem with dual boot ubuntu/w10 at GRUB: cannot load image

[pfelelep]

[EDIT: problem has been solved, It was due to an issue in GRUB2 being non-compatible with non-NX shim which includes Windows 10, to fix it:
Follow the instructions at https://wiki.ubuntu.com/Testing/EnableProposed then in a console sudo apt install -t oracular-proposed grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-efi-amd64-unsigned grub-pc grub-pc-bin grub2-common]


first of all, I would like to thank you as I am a new comer on the ubuntu forums


I have an issue at the moment with my dual boot ubuntu/w10. I am not sure if it's because of the upgrade, but just in case, if I may describe the problem?
I updated to the last ubuntu version (Ubuntu 24.10) and since, I cannot load windows from grub. when I choose windows, it shows an
"error
cannot load image"
black screen.


I have tried using boot.repair and here is the report:
https://paste.ubuntu.com/p/7k6GxdSYC3/


I have tried rescue-ing from a win installation usb media using terminal (and, yes, I deleted the hibernation file), but I cannot locate the issue.


I have searched the forum for a similar threat, but this cannot load image don't seems to be.

If someone pass by and could advice me?

Thank you.

[ubfan1]

What model machine? A pre-2012 UEFI without secure boot (so maybe delivered with Win7 in legacy), but both disks are gpt (implying UEFI for Windows). Confusing to me is sda has the legacy MBR boot, but sdb has the BIOS boot partition -- I guess it could still be booting in legacy, hence Windows wont run. What machine settings do you have for legacy (csm) vs UEFI?

[pfelelep]

Hello, thank you for helping me

it's a Dell Inspiron 7559 bought in 2016, I disabled the secure boot but it's supposed to be UEFI. I will double check in the bios and confirm.

[oldfred]

It looks like both are UEFI as Windows is only UEFI from gpt and you also have mount of esp in fstab.
And ESP shows both Microsoft & Ubuntu folders for UEFI boot.

Probably not related to Windows issues, but should be resolved.

GPT PMBR size mismatch (1953525167 != 3907029167) will be corrected by write.

Use gdisk and verify partitions are correct with p, or v to review issues, and use w to write the partition table. If not correct just use q to quit. That should update primary, backup & protective MBR. Details:
http://www.rodsbooks.com/gdisk/repairing.html &


Can you directly boot Windows from UEFI boot menu?
Grub only boots working Windows, but that also means Windows fast startup, hibernation must be off. If bitlocker it must be off. And NTFS must not need chkdsk. If you can boot Windows check those settings. Windows is known to turn fast startup back on with updates, so you may have to redo turning it off.

[pfelelep]

@ubfan1
I confirm it's UEFI (but with legacy oprom? (pict 3) would that be the problem? should I disable the legacy option rom? (in pict2))






@oldfred:
no, I can't directly boot Windows from UEFI boot menu, the windows boot manager (in pict 3) bring me back to Grub (pict 4)

I can't check the fast startup from here, but I deleted the hibernation file before.
How can I use gdisk? sorry I am confused.

[yancek]

should I disable the legacy option rom? (in pict2))

I would try that and reboot to test. Make sure when you are making changes to keep detailed notes of exactly what you do an the results.

Your UEFI information in boot repair beginning on line 206 shows an entry for Ubuntu and for the Hard Drive but does not show the standard entry: Windows Boot Manager
but it does show in the BIOS setting and the Grub menu which seems a bit odd to me but probably not related.

What did you do with the windows repair usb? Did you run chkdsk with options and if so, what options did you use?i

[oldfred]

You show a Windows boot loader in MBR, but Windows in UEFI will not boot from that.
And you do not have a Windows entry in UEFI.

This should create a new entry, if ESP is sda1, uses defaults:
sudo efibootmgr -c -L "Windows Boot Manager" -l "\EFI\Microsoft\Boot\bootmgfw.efi"

see also
man efibootmgr

[pfelelep]

@oldfred:

This should create a new entry, if ESP is sda1, uses defaults:
sudo efibootmgr -c -L "Windows Boot Manager" -l "\EFI\Microsoft\Boot\bootmgfw.efi"

Bingo! I rebooted, and windows loaded automatically.

Now, to bring back the dual boot... should I sudo update-grub or use bootrepair?
I wonder what made the UEFI windows entry disappear?

[pfelelep]

now, as I rebooted with the boot option (f12 key), I see that there is no more ubuntu option.


and choosing the 4th UEFI option (the "2nd" windows boot manager), brings me back to the GRUB dual-boot.

BUT


choosing from there, the windows boot manager (on /dev/sda1), gives me the "old" error cannot load image I was running into from the beginning... :/

[pfelelep]

@yancek

What did you do with the windows repair usb? Did you run chkdsk with options and if so, what options did you use?i

https://www.lifewire.com/how-to-rebuild-the-bcd-in-windows-2624508
I was trying to rebuild the BCD

the chkdsk command returned no error.