[Bug 1863994] [NEW] do not build (or sign) grubnetx64-installer.efi in Ubuntu

[Steve Langasek]

Public bug reported:

I just noticed that
http://archive.ubuntu.com/ubuntu/dists/focal/main/uefi/grub2-amd64/current/
includes a signed artifact I wasn't familiar with,
grubnetx64-installer.efi.signed.  This came in from Debian via commit
e8bc4a231a2e16c25e86b7288f6de0b5a0c9bb2f:

    Add an extra di-specific version of the UEFI netboot image
    
    Identical to the normal netboot image, but With a different baked-in
    prefix value ("$vendor-installer/$ARCH/grub" instead of "/grub").
    
    Helps to fix #928750, making d-i consistent in terms of PXE setup.

We do not need two netboot images for grub, and should definitely not be
signing two of them.

Please drop this artifact from the next grub2 upload.

** Affects: grub2 (Ubuntu)
     Importance: High
         Status: New

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1863994

Title:
  do not build (or sign) grubnetx64-installer.efi in Ubuntu

Status in grub2 package in Ubuntu:
  New

Bug description:
  I just noticed that
  http://archive.ubuntu.com/ubuntu/dists/focal/main/uefi/grub2-amd64/current/
  includes a signed artifact I wasn't familiar with,
  grubnetx64-installer.efi.signed.  This came in from Debian via commit
  e8bc4a231a2e16c25e86b7288f6de0b5a0c9bb2f:

      Add an extra di-specific version of the UEFI netboot image
      
      Identical to the normal netboot image, but With a different baked-in
      prefix value ("$vendor-installer/$ARCH/grub" instead of "/grub").
      
      Helps to fix #928750, making d-i consistent in terms of PXE setup.

  We do not need two netboot images for grub, and should definitely not
  be signing two of them.

  Please drop this artifact from the next grub2 upload.

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