[Bug 1111950] [NEW] Ubiquity should be able to install both grub-pc and grub-efi when needed

[YannUbuntu]

Public bug reported:

In some situations, it would be useful if Ubiquity (the Ubuntu
installer) could install both grub-pc and grub-efi at the same time:

1) when the Ubuntu live disk is launched in Legacy mode, but there is an
ESP on the disk.  (it can happen that the firmware is setup to boot the
HDD in UEFI mode, but the live media in Legacy mode).

2) when the Ubuntu live disk is launched in UEFI mode, but there is
another OS (eg Windows installed in Legacy mode) with no ESP on the
disk.  (it can happen that the firmware is setup to boot the HDD in
Legacy mode, but the live media in UEFI mode).

Remarks:
- from a live disk, it is impossible (AFAIK) to know in which mode the firmware is setup to boot the HDD.
- of course, prior to perform this improvement of Ubiquity, we need to improve GRUB2 to allow grub-pc and grub-efi to be installed at the same time.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1111950

Title:
  Ubiquity should be able to install both grub-pc and grub-efi when
  needed

Status in “ubiquity” package in Ubuntu:
  New

Bug description:
  In some situations, it would be useful if Ubiquity (the Ubuntu
  installer) could install both grub-pc and grub-efi at the same time:

  1) when the Ubuntu live disk is launched in Legacy mode, but there is
  an ESP on the disk.  (it can happen that the firmware is setup to boot
  the HDD in UEFI mode, but the live media in Legacy mode).

  2) when the Ubuntu live disk is launched in UEFI mode, but there is
  another OS (eg Windows installed in Legacy mode) with no ESP on the
  disk.  (it can happen that the firmware is setup to boot the HDD in
  Legacy mode, but the live media in UEFI mode).

  Remarks:
  - from a live disk, it is impossible (AFAIK) to know in which mode the firmware is setup to boot the HDD.
  - of course, prior to perform this improvement of Ubiquity, we need to improve GRUB2 to allow grub-pc and grub-efi to be installed at the same time.

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