partitioning: exclusive_open failed (partition already mounted)

[Tim Richardson]

New 23.10 installer can not install to external devices. Reproducible every time. Installer crashes or hangs.
Booting from USB installer. Installer was updated during the install process. Target device is a second USB stick.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: subiquity (unknown)
ProcVersionSignature: Ubuntu 6.5.0-9.9-generic 6.5.3
Uname: Linux 6.5.0-9-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.486
CloudArchitecture: x86_64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud)
CurtinAptConfig: /var/log/installer/subiquity-curtin-apt.conf
Date: Sun Oct 29 06:17:17 2023
DesktopInstallerRev: 1269
ExecutablePath: /snap/ubuntu-desktop-installer/1269/bin/subiquity/subiquity/cmd/server.py
InterpreterPath: /snap/ubuntu-desktop-installer/1269/usr/bin/python3.10
LiveMediaBuild: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
Lsusb:
 Bus 002 Device 003: ID 090c:2000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Intenso High Speed Line
 Bus 002 Device 002: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
     |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
     |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/8p, 480M
     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
MachineType: innotek GmbH VirtualBox
ProcAttrCurrent: snap.hostname-desktop-installer.subiquity-server (complain)
ProcCmdline: /snap/hostname-desktop-installer/1269/usr/bin/python3.10 -m subiquity.cmd.server --use-os-prober --storage-version=2 --postinst-hooks-dir=/snap/hostname-desktop-installer/1269/etc/subiquity/postinst.d
ProcEnviron:
 LANG=en_US.UTF-8
 LD_LIBRARY_PATH=<set>
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz layerfs-path=minimal.standard.live.squashfs --- quiet splash
Python3Details: /usr/bin/python3.11, Python 3.11.6, python3-minimal, 3.11.4-5
PythonDetails: N/A
SnapChannel: latest/stable
SnapRevision: 1269
SnapUpdated: False
SnapVersion: 0+git.1c719695
SourcePackage: subiquity
Title: install failed crashed with CalledProcessError
Traceback:
 Traceback (most recent call last):
   File "/snap/hostname-desktop-installer/1269/lib/python3.10/site-packages/curtin/block/__init__.py", line 1166, in exclusive_open
     fd = os.open(path, flags)
 OSError: [Errno 16] Device or resource busy: '/dev/sdc2'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:sku:
dmi.product.family: Virtual Machine
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH