[Bug 1929107] [NEW] Xubuntu 20.04.2 with root on ZFS always triggers grub's recordfail feature

[Nyyr]

Public bug reported:

I am installing Xubuntu 20.04.2 in VirtualBox with this configuration
simulating later installation on physical PC:

2 (HDD) disks in RAID0 and 1 SSD disk with exactly the same partitions
layout meant to represent RAID1 (some partitions via mdadm, some via
ZFS) with hybrid MBR (by default to boot via UEFI but to have the
possibility to boot via BIOS method on older hardware should this one
fail).

RAID0 (HDD)          SSD                   Mirrored via
-------------------------------------------------------
1 BIOS boot part.    1 BIOS boot part.     N/A
2 EFI part.          2 EFI part.           N/A
3 part. for bpool    3 part. for bpool     ZFS mirror
4 swap part.         4 swap part.          cryptsetup on mdadm RAID1
5 part. for rpool    5 part. for rpool     ZFS-encrypted ZFS mirror

I have installed grub both for BIOS boot and also for EFI boot on both
RAID0 (HDD) and SSD, EFI partitions being mounted under /boot/efi (SSD)
and /boot/efi2 (RAID0 HDD).

Since partman does not support root on ZFS custom configuration I have followed this guide:
https://openzfs.github.io/openzfs-docs/Getting%20Started/Ubuntu/Ubuntu%2020.04%20Root%20on%20ZFS.html

The installation boots but every time with long timeout (I set
GRUB_RECORDFAIL_TIMEOUT to 30) although I do not see any failure during
reboots.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: grub-efi-amd64 2.04-1ubuntu44
ProcVersionSignature: Ubuntu 5.4.0-73.82-generic 5.4.106
Uname: Linux 5.4.0-73-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.17
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Thu May 20 18:58:36 2021
SourcePackage: grub2-unsigned
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.logrotate.d.apport: [modified]
mtime.conffile..etc.logrotate.d.apport: 2021-05-20T17:04:14.196197

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1929107

Title:
  Xubuntu 20.04.2 with root on ZFS always triggers grub's recordfail
  feature

Status in grub2-unsigned package in Ubuntu:
  New

Bug description:
  I am installing Xubuntu 20.04.2 in VirtualBox with this configuration
  simulating later installation on physical PC:

  2 (HDD) disks in RAID0 and 1 SSD disk with exactly the same partitions
  layout meant to represent RAID1 (some partitions via mdadm, some via
  ZFS) with hybrid MBR (by default to boot via UEFI but to have the
  possibility to boot via BIOS method on older hardware should this one
  fail).

  RAID0 (HDD)          SSD                   Mirrored via
  -------------------------------------------------------
  1 BIOS boot part.    1 BIOS boot part.     N/A
  2 EFI part.          2 EFI part.           N/A
  3 part. for bpool    3 part. for bpool     ZFS mirror
  4 swap part.         4 swap part.          cryptsetup on mdadm RAID1
  5 part. for rpool    5 part. for rpool     ZFS-encrypted ZFS mirror

  I have installed grub both for BIOS boot and also for EFI boot on both
  RAID0 (HDD) and SSD, EFI partitions being mounted under /boot/efi
  (SSD) and /boot/efi2 (RAID0 HDD).

  Since partman does not support root on ZFS custom configuration I have followed this guide:
  https://openzfs.github.io/openzfs-docs/Getting%20Started/Ubuntu/Ubuntu%2020.04%20Root%20on%20ZFS.html

  The installation boots but every time with long timeout (I set
  GRUB_RECORDFAIL_TIMEOUT to 30) although I do not see any failure
  during reboots.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub-efi-amd64 2.04-1ubuntu44
  ProcVersionSignature: Ubuntu 5.4.0-73.82-generic 5.4.106
  Uname: Linux 5.4.0-73-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.17
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Thu May 20 18:58:36 2021
  SourcePackage: grub2-unsigned
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.logrotate.d.apport: [modified]
  mtime.conffile..etc.logrotate.d.apport: 2021-05-20T17:04:14.196197

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