Recover grub after windows update

Run this in Windows as an administrator:

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi

Or:

bcdedit /set "{bootmgr}" path \EFI\ubuntu\grubx64.efi

If you are using PowerShel.

Delete windows recovery partition

 Run in terminal as admin: Diskpart list disk select disk 0 list partition select partition X delete partition override

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