ubuquity crash during Groovy live install perhaps because I choose zsh and cypher

[tallagrand]

partitioning was zsh with cypher
my first time with these settings
Ubuntu 20.10 \n \l

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.13.1 [modified: usr/lib/ubiquity/plugins/ubi-usersetup.py usr/lib/ubiquity/user-setup/user-setup-ask-oem]
ProcVersionSignature: Ubuntu 5.8.0-43.49-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.455
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 20 15:00:09 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz boot=casper file=/cdrom/preseed/ubuntu.seed only-ubiquity quiet splash oem-config/enable=true ---
LiveMediaBuild: Ubuntu 20.10.0 2021.02.19 amd64 "Yourdev Groovy Gorilla" (20210219)
ProcEnviron:
 LANGUAGE=fr_FR.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 LC_NUMERIC=C.UTF-8
RebootRequiredPkgs:
 linux-image-5.8.0-43-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[tallagrand (tallagrand-thierry)]

sorry my mistake
not zsh but zfs