[Bug 1024383] Re: update-grub generates only BIOS based menu entries for Windows, even on UEFI systems

[Joseph Emenaker]

On 5/18/2013 12:14 AM, Jordan wrote:
> Upstream grub has done a lot of work to make sure that you *can* have 
> support for multiple platforms installed and in use at the same time, 
> with the same config.

I've notice that same thing. Right after I suggested "chainloader-efi" 
and "chainloader-mbr" entries, I came across references to *already* 
supported options for grub's "search" command, like "--hint-efi", 
"--hint-bios", and "--hint-baremetal"... all of which can supersede the 
"--hint" option.

So, it appears that upstream is already thinking along the lines of "one 
grub to rule them all".

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https://bugs.launchpad.net/bugs/1024383

Title:
  update-grub generates only BIOS based menu entries for Windows, even
  on UEFI systems

Status in “grub2” package in Ubuntu:
  Confirmed
Status in “os-prober” package in Ubuntu:
  Confirmed
Status in “grub2” package in Debian:
  New

Bug description:
  64bits computer with pre-installed EFI Windows 7. (remark: same bug if
  Windows8)

  Installed Ubuntu 64bits in dual-boot. GRUB (grub-efi) is correctly
  installed and allows to boot Ubuntu, but it does not allow to boot
  Windows.

  Its menu shows 2 INVALID Windows entries. When selecting these
  entries, it displays "Invalid EFI file path" error, and returns to
  GRUB menu.

  It appears that GRUB creates BIOS/mbr entries when it should be
  UEFI/gpt type entries.

  *********************** WORKAROUND **************************

  either boot Windows from the (EFI) BIOS menu, or add valid Windows entries via Boot-Repair.
  ***************************************************************

  (original thread in French: http://forum.ubuntu-
  fr.org/viewtopic.php?pid=10010231#p10010231 )

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