[Bug 1895211] Re: package friendly-recovery 0.2.41 [modified: lib/recovery-mode/recovery-menu] failed to install/upgrade: installed friendly-recovery package post-installation script subprocess returned error exit status 1

[Pelam]

It seems that it could be related to the stuff mentioned in this post:
https://askubuntu.com/a/943425/117278

sudo update-grub gave a strange error that seems maybe related:

/usr/sbin/grub-probe: error: failed to get canonical path of
`rpool/ROOT/ubuntu_3q4whe'.

However, doing as suggested in the linked post:
ZPOOL_VDEV_NAME_PATH=1 update-grub

succeeded. Afterwards update-grub works without the env variable...
strange

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Title:
  package friendly-recovery 0.2.41 [modified: lib/recovery-
  mode/recovery-menu] failed to install/upgrade: installed friendly-
  recovery package post-installation script subprocess returned error
  exit status 1

Status in friendly-recovery package in Ubuntu:
  Confirmed

Bug description:
  changed disco to focal in /etc/apt/sources.list !!
  1765 packages total in 3GB to update!!!

  should I just wipe and new-install??? ;-)

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: friendly-recovery 0.2.41
  ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
  Uname: Linux 5.4.0-47-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Sep  9 10:44:30 2020
  ErrorMessage: installed friendly-recovery package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2019-02-01 (587 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190131)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: friendly-recovery
  Title: package friendly-recovery 0.2.41 [modified: lib/recovery-mode/recovery-menu] failed to install/upgrade: installed friendly-recovery package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2020-09-09 (1 days ago)

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