[Bug 1025555] Re: Ubuntu32bits is incompatible with recent (UEFI) computers

[FredL]

A main and serious problem is that there are pc's/notebooks with recent
CPUs which are 32 bit which cannot be run in legacy mode, so they only
support EFI. An example of that is the ACER W510 mentioned before. I
cannot believe that is the only one and more will likely appear in the
(near) future. So I think it would make most sense to make sure the
32bit iso does support EFI properly just like the 64 bit one.

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Title:
  Ubuntu32bits is incompatible with recent (UEFI) computers

Status in “grub2” package in Ubuntu:
  Invalid
Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  64bits EFI computer (with GPT disk) with pre-installed 64bits
  Windows7.

  1) Installing Ubuntu 12.04 64bit creates a valid
  /efi/ubuntu/grubx64.efi entry. At reboot, the GRUB menu appears and
  allows to boot Ubuntu.

  2) Installing Ubuntu 12.04 32bits installs grub-pc, which creates no
  EFI entry. Ubuntu can't be booted (except if it is possible to
  deactivate EFI mode).

  3) Installing grub-efi from an already installed Ubuntu32 creates
  /efi/ubuntu/boot.efi , and /efi/ubuntu/grubia32.efi . Both EFI entries
  fail.

  4) Installing grub-efi in an already installed Ubuntu32 in chroot via
  an Ubuntu64 live-CD ( so that grub-efi has access to EFI variables)
  also creates two invalid EFI entries (/efi/ubuntu/boot.efi , and
  /efi/ubuntu/grubia32.efi ).

  
  CONCLUSION:
  - grub-efi 32bits always creates invalid entries.
  - Installing Ubuntu32 bits on an EFI system should be blocked by Ubiquity (the Ubuntu installer). In this case, Ubiquity should ask the user to install Ubuntu64 instead.
  - the Download page should warn that the 32bits ISO is not compatible with recent (EFI) computers

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