No options and lots of error reports on installation screen "How do you want to install Ubuntu"

[Walter Kiess]

This could relate to the probing error, but I'm not sure.
Trying to install Ubuntu from a Sandisk USB flash drive on 2nd the partition of an external USB drive. Installation stalls at the "How do you want to install Ubuntu" with heaps of error reports. On disconnecting the drive and going back then forward, all is fine. Reconnecting the drive and the errors start again.
External drive is a Toshiba Basics 1TB HDD with 2 partitions:
1) ntfs around 800GB with about 660GB of data I do not wish to loose
2) ext4, on which I have copied the Ubuntu 24.04LTS ISO using dd. I thought this would work, but it won't boot. Was trying to install Ubuntu and boot from it, but PC won't list the 2nd partition as a bootable drive.
The PC is populated with 1x SATA M.2 drive 1TB (Windows boot)
1x nvme M.2 drive 1TB
3x HDD, Samsung and WD, 1TB, 2TB, 500GB

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: subiquity (unknown)
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.498
CloudArchitecture: x86_64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud)
Date: Mon May 13 04:40:07 2024
DesktopInstallerRev: 171
ExecutablePath: /snap/ubuntu-desktop-bootstrap/171/bin/subiquity/subiquity/cmd/server.py
InterpreterPath: /snap/ubuntu-desktop-bootstrap/171/usr/bin/python3.10
LiveMediaBuild: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcAttrCurrent: snap.hostname-desktop-bootstrap.subiquity-server (complain)
ProcCmdline: /snap/hostname-desktop-bootstrap/171/usr/bin/python3.10 -m subiquity.cmd.server --use-os-prober --storage-version=2 --postinst-hooks-dir=/snap/hostname-desktop-bootstrap/171/etc/subiquity/postinst.d
ProcEnviron:
 LANG=C.UTF-8
 LD_LIBRARY_PATH=<set>
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz --- quiet splash
Python3Details: /usr/bin/python3.12, Python 3.12.3, python3-minimal, 3.12.3-0ubuntu1
PythonDetails: N/A
SnapChannel:

SnapRevision: 171
SnapUpdated: False
SnapVersion: 0+git.2d119e1b3
SourcePackage: subiquity
Title: block probing crashed with ValueError
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/29/2017
dmi.bios.release: 5.12
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.00
dmi.board.name: Z270 Extreme4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.00:bd03/29/2017:br5.12:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ270Extreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:skuToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.