[Bug 1855605] Re: ubuntu 19.10 zfs on root, grub2 failure

[Didier Roche]

for reference, this might be a duplicate of 1848856 as the error message
is one of the fix we made.

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Title:
  ubuntu 19.10 zfs on root, grub2 failure

Status in grub2 package in Ubuntu:
  New

Bug description:
  
  While doing apt upgrade, 

  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-5.3.0-24-generic
  I: The initramfs will attempt to resume from /dev/sda3
  I: (UUID=1c7a09f2-895b-4f6d-970e-2ef13f19ea00)
  I: Set the RESUME variable to override this.
  /etc/kernel/postinst.d/zz-update-grub:
  /usr/sbin/grub-probe: error: failed to get canonical path of `rpool/ROOT/ubuntu_w174bf'.
  run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1........] 
  dpkg: error processing package linux-image-5.3.0-24-generic (--configure):
   installed linux-image-5.3.0-24-generic package post-installation script subprocess returned e
  rror exit status 1
  Errors were encountered while processing:
   linux-image-5.3.0-24-generic
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec  8 11:51:44 2019
  InstallationDate: Installed on 2019-11-03 (35 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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