[Bug 1990745] [NEW] can't install Ubuntu 22.04 using BTRFS RAID1

[David F]

Public bug reported:

Installer fails when I attempt to install Ubuntu on BTRFS using RAID1.
Formatted disks outside of ubiquity, setup RAID1 through mkfs.btrfs,
choose something else choose to mount btrfs partition as / without
format.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubiquity 22.04.15
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.470
Date: Sat Sep 24 19:18:26 2022
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug jammy ubiquity-22.04.15 ubuntu

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https://bugs.launchpad.net/bugs/1990745

Title:
  can't install Ubuntu 22.04 using BTRFS RAID1

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Installer fails when I attempt to install Ubuntu on BTRFS using RAID1.
  Formatted disks outside of ubiquity, setup RAID1 through mkfs.btrfs,
  choose something else choose to mount btrfs partition as / without
  format.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubiquity 22.04.15
  ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
  Uname: Linux 5.15.0-25-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.470
  Date: Sat Sep 24 19:18:26 2022
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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