Ubiquity crashes a few seconds into the install process

[Mark Dixon]

I'm following the instructions at: https://mutschler.dev/linux/ubuntu-btrfs-20-04/#create-filesystems-for-root-and-efi-system-partitions.
All goes well until I attempt to work with the installer ("ubiquity --no-bootloader" command).
I can select language (English), keyboard (English) and TZ.
When I begin to fill out my user and machine information, ubiquity crashes.
In looking at the crash report, it seems casper is seeing some invalid stdin input.
I've double-checked the editing of /usr/lib/partman/mount.d/70btrfs and /usr/lib/partman/fstab.d/btrfs and all looks good. The only change I made was to not use the "noatime" parameter in the above edits.

I'm using Ubuntu desktop 22.04.4 from a USB stick to attempt the installation.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubiquity 22.04.20 [modified: lib/partman/fstab.d/btrfs lib/partman/mount.d/70btrfs]
ProcVersionSignature: Ubuntu 6.5.0-18.18~22.04.1-generic 6.5.8
Uname: Linux 6.5.0-18-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.470.2
CurrentDesktop: MATE
Date: Thu Mar 7 17:00:17 2024
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-MATE 22.04.4 LTS "Jammy Jellyfish" - Release amd64 (20240216.1)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)