[Bug 1840560] Re: "error: can't find command hwmatch" during grub

[Mauricio Faria de Oliveira]

Patch submitted to Debian in 990836. [1]

Waiting for review feedback there, if possible, for a bit, then moving
on w/ Ubuntu.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990836

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

** Changed in: grub2 (Ubuntu)
       Status: New => In Progress

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

** Changed in: grub2 (Ubuntu)
     Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)

** Changed in: grub2-signed (Ubuntu)
       Status: Confirmed => Invalid

** Bug watch added: Debian Bug tracker #990836
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990836

** Also affects: grub2 (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990836
   Importance: Unknown
       Status: Unknown

** Tags added: sts

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https://bugs.launchpad.net/bugs/1840560

Title:
  "error: can't find command hwmatch" during grub

Status in grub2 package in Ubuntu:
  In Progress
Status in grub2-signed package in Ubuntu:
  Invalid
Status in grub2 package in Debian:
  Unknown

Bug description:
  Upon disabling my grub menu using grub-customizer, I've noticed that
  just before the system boots and goes into the crypto password prompt
  the following error message appears on the display:

  ```
  error: can't find command hwmatch
  ```

  Looks like this command is referenced from /boot/grub/grub/cfg

  ```
      if hwmatch ${prefix}/gfxblacklist.txt 3; then
  ```
  However, the mod doesn't exist on grub's mod folder:

  ```
  ~ ls -la /boot/grub/x86_64-efi/*.mod|wc -l
  269

  ~ ls -la /boot/grub/x86_64-efi/hw*
  fish: No matches for wildcard “/boot/grub/x86_64-efi/hw*”

  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: grub-efi-amd64-signed 1.115+2.02+dfsg1-12ubuntu2
  ProcVersionSignature: Ubuntu 5.0.0-25.26-generic 5.0.18
  Uname: Linux 5.0.0-25-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Aug 18 00:22:41 2019
  InstallationDate: Installed on 2019-08-17 (0 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  SourcePackage: grub2-signed
  UpgradeStatus: No upgrade log present (probably fresh install)

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