I installed Ubuntu 18.04 in UEFI mode. After that I started boot-repair and restored Windows Loader. Then I rebooted and observed Windows Loader and pressed enter to load Windows ... You think it is end.

No, then I have faced with issue that \EFI\Microsoft\Boot\grubx64.efi is not found.

I have go to the directory: /boot/efi/EFI/Microfsoft/Boot/, and there are bootx64.efi and bootmngf.efi, there is no grubx64.efi !?


The most interesting that I have found the similar directory that was created by Windows 10 in /dev/sdc2 similar structure:

drwxrwxrwx 1 root root   8192 чер  3  2017  Boot
-rwxrwxrwx 1 root root 389330 бер 28  2017  bootmgr
-rwxrwxrwx 1 root root      1 лип 16  2016  BOOTNXT
-rwxrwxrwx 1 root root   8192 вер 18  2016  BOOTSECT.BAK
drwxrwxrwx 1 root root      0 вер 18  2016  Recovery
drwxrwxrwx 1 root root      0 бер 31 17:41 '$RECYCLE.BIN'
drwxrwxrwx 1 root root      0 гру 19  2016 'System Volume Information'

enter image description here

Seams like /dev/sdc2 is also EFI partition but created by Windows !?

Anyway, guys I am tried, a couple of days I have been trying to install properly Ubuntu 18.04 in UEFI mode and when I have succeed, I broke loading of Windows 10

Guy, help me maybe with some useful links how to fix properly loading of Windows 10 after installed Ubuntu in UEFI mode. Boot Repair does not helped at all. Previously I have used Boot Repair succesfully, but only for restoring Windows MBR, for GPT sems like it does not help at all

P.S.: In similar question ( Failed to open \EFI\Microsoft\Boot\grubx64.efi ) I have not got an idea how to fix the problem properly

Attachments: Boot-Repair Logs

  • You should disable hibernation(fast boot) in windows 10 for dual booting ubuntu. Otherwise it may cause data lose. And windows will check disks everytime you boot
    – Arun
    Jul 1, 2018 at 18:06
  • @Arun Thank you for reply, but how to restore loading Windows 10 ? ... Right now I have broken configuration for loading Windows 10 by GRUB \EFI\Microsoft\Boot\grubx64.efi is not found Jul 1, 2018 at 18:19
  • What brand/model system. Your Windows partitions are not typical UEFI boot Windows. docs.microsoft.com/en-gb/windows-hardware/manufacture/desktop/… Should not need grubx64.efi in /EFI/Boot, but some have just copied from /EFI/ubuntu to /EFI/Boot. Windows install problably overwrote /EFI/Boot/bootx64.efi with Windows boot loader. Grub normally makes it grub or shimx64.efi as some systems default boot that. Post the link to the Create BootInfo summary report. help.ubuntu.com/community/Boot-Info
    – oldfred
    Jul 1, 2018 at 18:22
  • @oldfred This system is my own assembly. No model. It has the following configuration: Processor - Intel Core i7-4770K, Graphic Card - Gigabyte PCI-Ex GeForce GTX 760, MotherBoard - Gigabyte GA-Z97X-UD5H, Disk SSD - Kingston HyperX Predator 480GB Jul 1, 2018 at 18:29
  • I have Asus Z97 with nVidia GT620. But SSD is sda where grub prefers to install. I have multiple Ubuntu installs all UEFI in both SSD & HDD. Need to your summary report from Boot-Repair. Grub really wants to install to first drive or normally sda, or first NVMe drive. Often easier to disconnect other drives. And keep Windows on one drive and Ubuntu on another, but all in same boot mode, either all UEFI or all BIOS boot.
    – oldfred
    Jul 1, 2018 at 19:20

1 Answer 1


Unfortunately I have not found easy solution.

Seems like Grub Repair has overwritten Windows Boot Loader and event Windows Repair from Live USB has not succeeded in repairing ...

I have just reinstalled Windows 10 from Live USB and it restored Windows Boot Loader properly. After this I have been able to start Ubuntu and Windows properly from Grub.

If there is easier solution I am ready to listen ...

Additional thanks to @oldfred

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.