[Bug 1050940] Re: Ubiquity fails creating a correct Windows dualboot on EFI computers (grub-pc <-> grub-efi)

[Steve Langasek]

> You forget that the fact that many UEFI firmwares can
> boot on the CD/USB in a different mode than on the HDD.

No, I don't forget that at all; I assert that it is a stupid firmware
design that makes it nearly impossible for an OS vendor to do the right
thing when installing to the hard drive.

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https://bugs.launchpad.net/bugs/1050940

Title:
  Ubiquity fails creating a correct Windows dualboot on EFI computers
  (grub-pc <-> grub-efi)

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  Currently, Ubiquity sometimes fails creating a correct Windows dualboot when:
  - either it installs Ubuntu in EFI mode when Windows is installed in Legacy mode ( examples: Bug #908109 , Bug #959446 , Bug #956412
  http://ubuntuforums.org/showthread.php?p=12238420#post12238420 )
  - or it installs Ubuntu in Legacy (not-EFI) mode when Windows is installed in EFI mode. ( example: http://ubuntuforums.org/showpost.php?p=12246811&postcount=6 )

  In order to create a correct dualboot, Ubiquity should always install
  Ubuntu in the same mode as Windows.

  I think the deep problem is that Ubiquity only looks at /sys/firmware/efi (or dmesg | grep EFI) to determine if it is going to install in EFI mode or not. AFAIK, dmesg only indicates the mode in which the BIOS boots the live media, NOT the mode in which the BIOS boots the HDD.
  Remark: currently Ubuntu32bit is not EFI compatible (see Bug #1025555 ), so Ubiquity32bit will always install in Legacy mode (which allowed the OP of Bug #908109 to workaround the current bug).

  (this problem is more and more frequent as new computers generally
  come with EFI firmware)

  *************** WORKAROUND: using Boot-Repair to convert Ubuntu in the same mode as Windows.
  See https://help.ubuntu.com/community/UEFI

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