[Bug 1908796] Re: 20_linux_xen is missing the same treatments of 10_linux_zfs creating unbootable Ubuntu 20.04 ZFS systems with Xen

[Doug Goldstein]

** Patch added: "0001-zfs-fix-LINUX_ROOT_DEVICE-when-grub-probe-fails.patch"
   https://bugs.launchpad.net/grub/+bug/1908796/+attachment/5445128/+files/0001-zfs-fix-LINUX_ROOT_DEVICE-when-grub-probe-fails.patch

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Title:
  20_linux_xen is missing the same treatments of 10_linux_zfs creating
  unbootable Ubuntu 20.04 ZFS systems with Xen

Status in grub:
  Unknown
Status in grub2 package in Ubuntu:
  New

Bug description:
  If you install Xen on your Ubuntu 20.04 system with ZFS, the system
  becomes unbootable because the adjustments made by Canonical to GRUB
  by providing 10_linux_zfs to override 10_linux aren't done to
  20_linux_xen as well. I'm not asking for the same level of zys
  integration with a Xen system, I'm just asking for a bootable system.
  The following patch was posted to the GRUB mailing list and it would
  be good to backport it so that people don't experience systems that
  don't boot.

  https://lists.gnu.org/archive/html/grub-devel/2020-12/msg00239.html

  Other people have experienced this as well based on
  https://askubuntu.com/questions/1271948/ubuntu-20-04-with-zfs-root-
  fails-to-boot-after-installing-xen

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