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I just installed an Ubuntu 18.04 on the side of my windows 10 partition. after the install, every time I tried to boot to windows it always told me that winload.exe does not exist/is corrupted and windows can't boot.

Apparently grub has incorrectly assigned my second HDD as the windows 10 boot drive (/dev/sdc1) instead of my SSD (SATA 0, partition 0)(/dev/sda0/ I think), that of telling windows to try to boot from there, and of course, it didn't work, as there are no windows there.

So how can I change it to point to the SSD instead?

also, a little clarifier :

I have 1 SSD and 2 HDD, formerly I only have 1 HDD, but I've since upgraded to an SSD and proceed to reinstall windows to the new SSD. I forgot if I ever did a full wipe on the former HDD, as there is still some leftover windows file (who knows if the MBR ever get wiped on that HDD)

I haven't yet tried to boot it from the windows boot manager option on bios, I guess I will try that later

edit : added the output from boot-info

after i see the boot-info output, there are something that i don't understand. like why grub told me in the grub menu that windows is on /dev/sdc3/ when clearly sdc3 is not even a thing on my computer.

and when i run the sudo update-grub command, the windows partition changes to sdc1, which is a thing, but still is the wrong HDD

Edit 2 :

I did the bootrec /fixmbr thing to try and restore windows bootloader into MBR. But sadly i still can't boot back to windows, let alone ubuntu. And as i dont have much time, i just reinstalled the whole thing.

Thank you very much for everyone bothering to answer. I hope your answer will be beneficial for someone else

Muhammad Syarif
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2 Answers2

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I would first repair your Windows 10 boot up with Win 10 ISO USB or DVD.

After your Windows is booting from MBR, boot up Ubuntu live CD or USB, open terminal and issue following commands (/dev/sda1 should be your linux partition, if not, change the letter accordingly, sda should be your first disk where you are booting from in BIOS - see grub-install command):

sudo su

fdisk -l

mount /dev/sda1 /mnt/

mount -t proc none /mnt/proc

mount -o bind /dev /mnt/dev

mount -t sysfs sys /mnt/sys

chroot /mnt/ /bin/bash

update-grub

/usr/sbin/grub-install --recheck --no-floppy /dev/sda

sync

reboot

In the last step may instead of reboot command choose reboot from the menu.

kukulo
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IF the two are on separate drives installed internally, you would (or may) have to use the Advanced Boot Menu (F12 usually). For the non-default OS, you would highlight and select the alternate drive to boot from.

Basically, the secondary drive boot manager is hidden unless you are booting directly into that drive. I have a similar set-up on one of my systems. My Ubuntu is installed onto a secondary HDD while Windows 10 (my default for gaming purposes) is the default drive. Ubuntu is the layer UNDER the initial layer to boot so when pressing F12 for the boot options I'd have something like:

LEGACY BOOT

•Internal HDD <- (this is actually my default SSD)

•CD/DVD/CD-RW Drive

•Onboard NIC

•USB Storage Device

UEFI BOOT:

•Windows Boot Manager (Or name of 2nd hard drive containing Windows®)

OTHER OPTIONS:

•BIOS Setup

•Device Configuration

•Diagnostics

user3885313
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