[Bug 1991676] Re: Package grub-efi-arm64-signed 1.173.2~18.04.1+2.04-1ubuntu47.4 from bionic-proposed fails to install/upgrade (grub-install: error: efibootmgr: not found.)

[Francis Ginther]

@juliank Hello, I see that you picked up
https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.4/+bug/1991676. I
just want to mention so that you are aware, that this is blocking most,
if not all, kernel ADT testing on bionic arm64.

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https://bugs.launchpad.net/bugs/1991676

Title:
  Package grub-efi-arm64-signed 1.173.2~18.04.1+2.04-1ubuntu47.4 from
  bionic-proposed fails to install/upgrade (grub-install: error:
  efibootmgr: not found.)

Status in ubuntu-kernel-tests:
  New
Status in grub2-signed package in Ubuntu:
  Invalid
Status in linux-hwe-5.4 package in Ubuntu:
  Confirmed
Status in grub2-signed source package in Bionic:
  Triaged
Status in linux-hwe-5.4 source package in Bionic:
  Confirmed

Bug description:
  The ADT tests for arm64 kernels in Bionic are failing during the setup
  phase with the following errors:

  Setting up grub-efi-arm64-signed (1.173.2~18.04.1+2.04-1ubuntu47.4) ...
  Installing for arm64-efi platform.
  grub-install: error: efibootmgr: not found.
  dpkg: error processing package grub-efi-arm64-signed (--configure):
   installed grub-efi-arm64-signed package post-installation script subprocess returned error exit status 1
  Setting up libx11-6:arm64 (2:1.6.4-3ubuntu0.5) ...
  Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
  Processing triggers for libc-bin (2.27-3ubuntu1.6) ...
  Errors were encountered while processing:
   grub-efi-arm64-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  blame: 
  badpkg: testbed setup commands failed with status 100
  autopkgtest [15:12:03]: ERROR: erroneous package: testbed setup commands failed with status 100

  ADT test log:
  https://autopkgtest.ubuntu.com/results/autopkgtest-bionic/bionic/arm64/l/linux-hwe-5.4/20220930_151219_13ac3@/log.gz

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