[Bug 1896308] Re: /usr/sbin/grub-probe: error: failed to get canonical path of <root volume>

[Mate Kukri]

*** This bug is a duplicate of bug 1940723 ***
    https://bugs.launchpad.net/bugs/1940723

** This bug has been marked a duplicate of bug 1940723
   GRUB (re)installation failing due to stale grub-{pc,efi}/install_devices

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https://bugs.launchpad.net/bugs/1896308

Title:
  /usr/sbin/grub-probe: error: failed to get canonical path of <root
  volume>

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  Using ZFS as boot drive.  Error occurs on automatic snapshotting.

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-pc 2.04-1ubuntu26.4
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  NonfreeKernelModules: lkp_Ubuntu_5_4_0_42_46_generic_70 zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Sep 18 07:37:31 2020
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2020-04-26 (145 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcCmdLine: BOOT_IMAGE=/BOOT/ubuntu_tf2i6u@/vmlinuz-5.4.0-42-generic root=ZFS=rpool/ROOT/ubuntu_tf2i6u ro quiet splash
  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: grub2
  Title: package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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