[Bug 1648278] Re: Make Ubuntu 32-bit ISO image directly installable on UEFI machine

[UlfZibis]

@Alkis, thanks for being back again.

I never have seen this grub menu with Ubuntu Life media, even when
burned to CD. The reason may be, that I regularly use MultiSystem since
some years or never had a EFI machine in my hands before using
MultiSystem (does this grub menu appear also on BIOS machines?).

But a problem remains ... I suspect, the "change media trick" will work
with USB media instead CD media.

Maybe I can try your steps 4), 5) after booting via MultiSystem ... "Try
Ubuntu" with 32-bit ISO.

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Title:
  Make Ubuntu 32-bit ISO image directly installable on UEFI machine

Status in grub2-signed package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Only with a workaround I can install Ubuntu 32-bit on a UEFI machine:
  - First install Ubuntu 64-bit on a temporary partition.
  - Then install Ubuntu 32-bit with ubiquity -b
  - Start Ubuntu 64-bit and run update-grub.
  - Start Ubuntu 32-bit.

  To make Ubuntu 32-bit update-proof I can run:
  sudo apt install grub-efi-amd64
  sudo mount /dev/sda1 /boot/efi
  sudo grub-install --efi-directory /boot/efi --force-extra-removable
  After I can delete the temporary Ubuntu 64-bit installation

  To make Ubuntu 32-bit again bootable with UEFI secure boot I can additionally run:
  sudo dpkg --add-architecture amd64
  sudo apt-get update
  sudo dpkg --install Download/grub-efi-amd64-signed_1.66.2+2.02~beta2-36ubuntu3.2_amd64.deb
  sudo dpkg-reconfigure grub-efi-amd64-signed
  sudo grub-install
  sudo apt-get install shim
  sudo dpkg-reconfigure grub-efi-amd64-signed
  sudo dpkg-reconfigure shim
  sudo grub-install

  Please make this possible directly with the Ubuntu 32-bit ISO image !

  Rationale: The recommended 64-bit Ubuntu and 64-bit applications need
  up to 30 % more RAM so the pain of swapping occurs more likely and on
  UEFI-machines with few resources such as Netbooks. Their 64-bit
  applications often perform up to 30 % slower than 32-bit applications,
  e.g.: Firefox.

  See also: bug 1650337, bug 1649167

  Another WORKAROUND only using the 32-bit Live-image via "Try Ubuntu":

  ubiquity -b

  sudo mount /dev/sdaX /mnt           # Ubuntu target partition sdaX
  sudo mount /dev/sda1 /mnt/boot/efi  # EFI-partition sda1
  for dir in /dev /dev/pts /proc /sys /run; do sudo mount --bind $dir /mnt/$dir; done
  sudo chroot /mnt /bin/bash

  dpkg --add-architecture amd64
  apt-get update
  apt-get install grub-efi-amd64-signed
  Optional: shim-signed
  grub-install [--efi-directory /boot/efi]
  update-grub
  exit

  In case of dual boot with Windows, in EFI-setup the boot order must me changed.
  Surprisingly, there was a menu entry in NVRAM, even the configuration via efibootmgr is impossible, caused by missing efivarfs driver in the 32-bit kernel.

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