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Yesterday I have managed to successfully install and configure Ubuntu 18.04 LTS as a second operating system on my PC.Everything works fine,however there is one thing that confuses me:
In the GRUB,among all other boot options I have:

  1. Windows UEFI bootmgfw.efi.
  2. Windows Boot Manager (on /dev/...)

Essentially both of them successfully boot Windows 10,so my questions are: Are there any differences between this two options in terms of operations or functionality of Windows 10? What are the differences between these options?

Kulfy
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Sergiy
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  • Good question. In my case I had over 5 Windows boot options in Grub many of which did not work: https://askubuntu.com/questions/938633/boot-repair-created-too-many-grub-menu-entries-for-windows/1022700#1022700 – WinEunuuchs2Unix Jul 06 '19 at 16:23
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    @WinEunuuchs2Unix the extra GRUB boot choices come from having run boot-repair. It puts a file in /etc/grub.d/25_custom that adds the extras. Just delete that file and sudo update-grub, and your GRUB menu will look nice again. – heynnema Jul 06 '19 at 17:16

1 Answers1

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This explains the difference quite clearly. If both work, there should be no difference between booting with the .efi file vs. using bootmgr from a user's perspective.

morjova
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