[Bug 1781639] [NEW] grub-pc 2.02-2ubuntu8.1 fails in setup with ZFS root filesystem

[Tessa]

Public bug reported:

on trying to upgrade grub-pc today to version 2.02-2ubuntu8.1, I get the
following error on my server with ZFS root:

Setting up grub-pc (2.02-2ubuntu8.1) ...
/usr/sbin/grub-probe: error: failed to get canonical path of `rpool/root'.
dpkg: error processing package grub-pc (--configure):
 installed grub-pc package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)

ZFS root worked fine with grub-pc prior to this package release, so this
feels like a package regression.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: grub-pc 2.02-2ubuntu8.1
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Fri Jul 13 10:31:56 2018
InstallationDate: Installed on 2014-11-09 (1341 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to bionic on 2018-05-20 (53 days ago)

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


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1781639

Title:
  grub-pc 2.02-2ubuntu8.1 fails in setup with ZFS root filesystem

Status in grub2 package in Ubuntu:
  New

Bug description:
  on trying to upgrade grub-pc today to version 2.02-2ubuntu8.1, I get
  the following error on my server with ZFS root:

  Setting up grub-pc (2.02-2ubuntu8.1) ...
  /usr/sbin/grub-probe: error: failed to get canonical path of `rpool/root'.
  dpkg: error processing package grub-pc (--configure):
   installed grub-pc package post-installation script subprocess returned error exit status 1
  Errors were encountered while processing:
   grub-pc
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ZFS root worked fine with grub-pc prior to this package release, so
  this feels like a package regression.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: grub-pc 2.02-2ubuntu8.1
  ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Fri Jul 13 10:31:56 2018
  InstallationDate: Installed on 2014-11-09 (1341 days ago)
  InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: Upgraded to bionic on 2018-05-20 (53 days ago)

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