[Bug 1647235] [NEW] Wrong /boot/grub/grub.cfg processed after change of GRUB_DISTRIBUTOR

[UlfZibis]

Public bug reported:

I have 2 Ubuntu 64-Bit installations on 2 different partitions.
I have added a 2nd UEFI boot directory:
/boot/efi/EFI/ubuntu-64
After booting into the 2nd installation, I have changed in /etc/default/grub:
GRUB_DISTRIBUTOR="Ubuntu-64"
After grub-install and update-grub I got new .efi files in /boot/efi/EFI/ubuntu-64 and a new /boot/grub/grub.cfg and /boot/efi/EFI/ubuntu-64/grub.cfg refers to the partition of the 2nd installation.

When I again boot via /boot/efi/EFI/ubuntu-64 the /boot/grub/grub.cfg of
the 1st installation is processed instead the one of the 2nd
installation. I think, this is wrong.

Looking into /boot/efi/EFI/ubuntu-64/grubx64.efi of the 2nd installation
with a hex editor I find the string EFI/ubuntu instead EFI/ubuntu-64.

** Affects: grub2-signed (Ubuntu)
     Importance: Undecided
         Status: New

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

** Also affects: grub2-signed (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1647235

Title:
  Wrong /boot/grub/grub.cfg processed after change of GRUB_DISTRIBUTOR

Status in grub2-signed package in Ubuntu:
  New
Status in multiboot package in Ubuntu:
  New

Bug description:
  I have 2 Ubuntu 64-Bit installations on 2 different partitions.
  I have added a 2nd UEFI boot directory:
  /boot/efi/EFI/ubuntu-64
  After booting into the 2nd installation, I have changed in /etc/default/grub:
  GRUB_DISTRIBUTOR="Ubuntu-64"
  After grub-install and update-grub I got new .efi files in /boot/efi/EFI/ubuntu-64 and a new /boot/grub/grub.cfg and /boot/efi/EFI/ubuntu-64/grub.cfg refers to the partition of the 2nd installation.

  When I again boot via /boot/efi/EFI/ubuntu-64 the /boot/grub/grub.cfg
  of the 1st installation is processed instead the one of the 2nd
  installation. I think, this is wrong.

  Looking into /boot/efi/EFI/ubuntu-64/grubx64.efi of the 2nd
  installation with a hex editor I find the string EFI/ubuntu instead
  EFI/ubuntu-64.

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