[Bug 1453980] Re: grub-install installs wrong bootloader when --removable and --uefi-secure-boot are used.

[Ubfan]

On Ubuntu 16.04, uefi secure boot enabled, grub-efi package
2.02~beta2-36ubuntu3.15, the original problem has been fixed, like the
suggestion in the original posting (just use shim) , but now the --no-
uefi-secure-boot switch on grub-install does not cause grubx64.efi to be
used as .../EFI/Boot/bootx64.efi, instead the legacy core.img is used.
There is apparently no way to install grub to a removable disk for use
on a non-secure boot UEFI system from a 16.04 secure boot system.

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https://bugs.launchpad.net/bugs/1453980

Title:
  grub-install installs wrong bootloader when --removable and --uefi-
  secure-boot are used.

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Ubuntu 15.04
  With the --removable switch, grub-install will now correctly install grubx64.efi as the default bootloader
  in the EFI partition's /EFI/Boot/bootx64.efi file, but with the addition of --uefi-secure-boot, it still
  uses grubx64.efi as bootx64.efi instead of shimx64.efi.  The use of both --removable and --uefi-secure-boot 
  should result in shimx64.efi copied to the /EFI/Boot/bootx64.efi file, and  grubx64.efi just copied to the
  /EFI/Boot directory. 
    Since the shimx64 as bootx64.efi will work with secure boot enabled or disabled, the easiest solution would be to just use it every time the --removable is used.
    grubx64.efi will not successfully boot a UEFI machine with secure boot enabled.

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