Installer crashed while attempting btrfs on top of LUKS for root FS.

[Jordan]

What I did:

Configured ubiquity with a root FS that was btrfs on top of LUKS on a GPT partition.

A /boot/ FS that was btrfs on top of a regular GPT partition.

A /boot/efi/ that was fat32 on top of a regular GPT partition.

What I expected to happen:

Ubuntu would install fine.

What happened instead:

An error message that ubiquity had crashed and this bug report.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.19
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
Date: Sun Sep 12 17:00:29 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash toram ---
LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Jordan (jordanu)]

All partitioning was done via ubiquity, starting by creating a new partition table to start totally from scratch.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Carlos Nihelton (cnihelton)]

I attempted doing a similar install with Kinetic and Jammy, both crashed in the very same way.