I am on a Windows 10 / Ubuntu 20.04 dual boot machine. Recently, Windows has not been able to install updates (after rebooting, it says couldn't complete updates, reverting changes). Now I want to test whether it'll work with the standard windows bootloader, so I want to remove GRUB and restore the Windows bootloader.
According to diskmgmt.msc → disk 0 → properties → Volumes, the partition style of my disk is Master Boot Record (MBR). My Mainboard has UEFI.
What I have done so far:
- Created a Win10 boot disk
- From Boot disk → troubleshooting tried the option "startup repair", which didn't do anything
- in recovery cmd:
bootrec /fixmbr→ command is run successfully - in recovery cmd:
bootrec /fixboot→ acces denied
Then I read in Cannot boot windows 10, “bootrec /fixboot” gives “access denied” that bcdboot C:\Windows should help in this case, but I'm getting Failure when attempting to copy boot files as an error. As an alternative, also the command bcdboot C:\windows /s S is given, where S is the EFI partition. The problem is that I don't seem to have an EFI partition:
Here the very left partition, 256gb, belongs to Ubuntu. The System reserved partition is NTFS, so as far as I understand it, this cannot be the EFI partition?. C:\ is my Windows installation. The very right seems to be a recovery partition.
I could try to run bcdboot C:\windows /s S with S being the System Reserved Partition, but I don't really have a clue what that is doing.
Any hints on how I could solve my problem?
