ZFS installation crash when ESP already exists

[Soundwave]

Tried installing Ubuntu with ZFS auto partitioning. Crashed

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.21
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: 1.427
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 26 22:18:05 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Jean-Baptiste Lallement (jibel)]

Thanks for your report.

Repartitioning failed because the ESP partition of the target disk was already mounted:

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Jan 27 06:17:57 ubuntu ubiquity: Checking that no-one is using this disk right now ... FAILED
Jan 27 06:17:57 ubuntu ubiquity:
Jan 27 06:17:57 ubuntu ubiquity: This disk is currently in use - repartitioning is probably a bad idea.
Jan 27 06:17:57 ubuntu ubiquity: Umount all file systems, and swapoff all swap partitions on this disk.
Jan 27 06:17:57 ubuntu ubiquity: Use the --no-reread flag to suppress this check.

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05efi: debug: /dev/nvme0n1p1 is a FAT partition (mounted by GRUB)

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[Łukasz Zemczak (sil2100)]

Do we still want to get this fixed for the beta? What is the status of this one?

[Iain Lane (laney)]

Feels like it's probably too late to me to be fixing ubiquity, I think it's move the milestone + release note.

[Jean-Baptiste Lallement (jibel)]

It won't be fixed for Beta. I don't have a reproducible case yet.