[Bug 1848399] Re: update-grub fails if zpools with unsupported feature_flags exist

[Didier Roche]

waow, do you have features enabled on some pools not supported in our
ZFS 0.8.1 version? Would be interesting to know.

|| true is a little bit too much without filtering what was imported. We
can maybe force at least importing a bpool and rpool (whatever it is) to
ensure that grub will install a grub.cfg with at least one bootable
system, but what about system with ZFS installed with no pools at all?

That sounds it needs deeper investigation and is (fortunately) only touching advanced users that can debug for now :)
Let's add that to the list for 20.04 and figure out what's the right actions are.

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https://bugs.launchpad.net/bugs/1848399

Title:
  update-grub fails if zpools with unsupported feature_flags exist

Status in grub2 package in Ubuntu:
  Incomplete
Status in ubiquity package in Ubuntu:
  Invalid
Status in zsys package in Ubuntu:
  Invalid

Bug description:
  install from Oct 14 live installer failed.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubiquity 19.10.20
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CasperVersion: 1.425
  Date: Wed Oct 16 20:03:30 2019
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed quiet splash ---
  LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191014)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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