[Bug 2004133] Re: package grub-pc 2.06-2ubuntu12.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[Julian Andres Klode]

This bug only affects zfs systems that have modified fstab without
reloading systemd.

Essentially we run find on $boot_dir which is set as


    # read available kernels from /boot
    boot_dir="$(try_default_layout_bpool "${dataset}" "${mntdir}")"
    if [ -z "${boot_dir}" ]; then
        boot_dir=$(get_system_directory "${dataset}" "boot" "false" "${mntdir}" "${etc_dir}")
    fi      

which somehow ends up being

'mount: (hint) your fstab has been modified, but systemd still uses\n
the old version; use 'systemctl daemon-reload' to
reload.\n/tmp/zfsmnt.liPzsI/boot'

It's not clear to me why the hint is on stdout in the first place.

This then causes the script to exit, which causes the trap to run which
is broken due to bug 2031042.

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => Medium

** Summary changed:

- package grub-pc 2.06-2ubuntu12.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
+ grub zfs integration fails when fstab has been modified without reloading systemd

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https://bugs.launchpad.net/bugs/2004133

Title:
  grub zfs integration fails when fstab has been modified without
  reloading systemd

Status in grub2 package in Ubuntu:
  Triaged

Bug description:
  dont know

  ProblemType: Package
  DistroRelease: Ubuntu 22.10
  Package: grub-pc 2.06-2ubuntu12.1
  ProcVersionSignature: Ubuntu 5.19.0-29.30-generic 5.19.17
  Uname: Linux 5.19.0-29-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.23.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Mon Jan 23 21:25:33 2023
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  ProcCmdLine: BOOT_IMAGE=/BOOT/ubuntu_7ydweu@/vmlinuz-5.19.0-29-generic root=ZFS=rpool/ROOT/ubuntu_7ydweu ro quiet splash vt.handoff=1
  Python3Details: /usr/bin/python3.10, Python 3.10.7, python3-minimal, 3.10.6-1
  PythonDetails: N/A
  RelatedPackageVersions:
   dpkg 1.21.9ubuntu1
   apt  2.5.3
  SourcePackage: grub2
  Title: package grub-pc 2.06-2ubuntu12.1 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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