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

[YannUbuntu]

I agree with Jordan's new title.
And also with Phillip statement (You can't boot windows in bios mode if grub is booted in efi mode, and vice versa).

I saw several Windows installations which are bootable both via Legacy and via UEFI. 
I agree with Jordan's suggestion to always create&display both Legacy and UEFI based Win entries.

+1 to add the error message too, and i suggest to add it 'live' at boot. For example, via grub-script we could maybe detect if grub was loaded in Legacy or UEFI; if loaded in Legacy mode, then it would add "(won't work unless BIOS is setup to boot in UEFI mode)" at the end of ALL uefi entries. And vice versa: if loaded in UEFI mode,  it would add "(won't work unless BIOS is setup to boot in Legacy mode)" at the end of ALL bios entries. . In order to shorten the string and to avoid too much localization work, maybe eg "Ubuntu 13.04 (UEFI mode)" would be enough.
BTW, i know that "won't work unless BIOS is setup to boot in Legacy / UEFI mode" is not totally correct vocabulary (should be "won't work unless your firmware is setup to boot in BIOS / UEFI mode"), but that's what users will generally find in their firmwares, so let's make their life easier ;)

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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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