This answer is for those with UEFI who have deleted the Ubuntu partitions before removing grub
You will be doing this from Windows 10. No bootable media required.
Where bootrec /fixmbr
, bootsect /nt60
and the Ubuntu live with the boot-repair
suggestions have failed, this has worked for me:
(This answer borrowed verbatim from here)
- Run a
cmd.exe
process with administrator privileges
- Run
diskpart
- Type:
list disk
then sel disk X
where X is the drive your boot files reside on
- Type
list vol
to see all partitions (volumes) on the disk
- Select the EFI volume by typing:
sel vol Y
where Y is the SYSTEM
volume (this is almost always the EFI partition)
- For convenience, assign a drive letter by typing:
assign letter=Z:
where Z is a free (unused) drive letter
- Type
exit
to leave disk part
- While still in the
cmd
prompt, type: Z:
and hit enter, where Z was the drive letter you just created.
- Type
dir
to list directories on this mounted EFI partition
- If you are in the right place, you should see a directory called
EFI
- Type
cd EFI
and then dir
to list the child directories inside EFI
- Type
rmdir /S ubuntu
to delete the ubuntu boot directory
Assuming you only ever had two operating systems (Win 10 & Ubuntu) you should now be able to boot directly to Windows without hitting the black grub screen.
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