[Bug 2028702] Re: grub not accessing zfs root file system

[Paul White]

** Package changed: ubuntu => grub2 (Ubuntu)

** Tags added: lunar

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Title:
  grub not accessing zfs root file system

Status in grub2 package in Ubuntu:
  New

Bug description:
  Grub can not access ubuntu on root zfs. System does not boot any more.

  What was tried:
  - Booting from an USB-ubuntu, then mounting zfs:
    mkdir K
    zpool import -R /root/K rpool
    zpool import -R /root/K bpool
    mount -R /sys /root/K/sys
    mount -R /dev /root/K/dev
    mount -R /proc /root/K/proc
    mount -R /tmp /root/K/tmp
    cp /etc/resolv.conf /root/K/etc/resolv.conf
    chroot /root/K /bin/bash
    . /etc/profile
    cd
    mount /boot/efi
    mount -B /boot/efi/grub /boot/grub
    apt update
    apt upgrade
    apt reinstall grub
    -> no errors reported
    grub-install /dev/sda
    -> no errors reported
    update-grub
    -> no errors reported

    umount /boot/grub
    umount /boot/efi
    exit
    reboot

  System rebooted into grub, then grub tells again:
  "/BOOT/ubuntu_sxscpx@/vmlinux-6.2.0-26-generic" not found.

  Going to grub commandline trying to list zfs info with "zfsinfo
  (hs0,4)" tells me: unsupported festures in pool.

  Kernel: linux-modules-6.2.0-26-generic linux-image-6.2.0-26-generic  6.2.0-26-generic
  zfs: fsutils-linux  2.1.9-2ubuntu1.1
  grub: grub-*  2.06-2ubuntu16

  Grub itself loads, but cant access zfs filesystems. even after
  upgrading to the latest tools and versions.

  /etc/lsb-release:
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=23.04
  DISTRIB_CODENAME=lunar
  DISTRIB_DESCRIPTION="Ubuntu 23.04"

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