[Bug 2130341] [NEW] Ubiquity crashes when trying to install Ubuntu 25.10

[Aditya Garg]

Public bug reported:

On Ubuntu 25.10, when I try to install Ubuntu using ubiquity, the
installer crashes. The journalctl reports the following errors:

Oct 30 19:38:02 ubuntu plugininstall.py[12279]: log-output -t ubiquity umount /target/cdrom
Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 1869, in <module>
Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 62, in wrapper
Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 192, in run
Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 506, in configure_plugins
Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 482, in run_plugin
Oct 30 19:38:12 ubuntu plugininstall.py[12279]: ubiquity.install_misc.InstallStepError: Plugin usersetup failed with code 2

Full journalctl has been attached

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: ubiquity 25.10.4
ProcVersionSignature: Ubuntu 6.17.0-5.5-generic 6.17.0-rc7
Uname: Linux 6.17.0-5-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 25.10.2
CloudArchitecture: x86_64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud)
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 30 19:42:08 2025
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz --- quiet splash
LiveMediaBuild: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug questing ubiquity-25.10.4 wayland-session

** Attachment added: "Full journalctl of the live ISO when ubiquity crashed."
   https://bugs.launchpad.net/bugs/2130341/+attachment/5922492/+files/journalctl.txt

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https://bugs.launchpad.net/bugs/2130341

Title:
  Ubiquity crashes when trying to install Ubuntu 25.10

Status in ubiquity package in Ubuntu:
  New

Bug description:
  On Ubuntu 25.10, when I try to install Ubuntu using ubiquity, the
  installer crashes. The journalctl reports the following errors:

  Oct 30 19:38:02 ubuntu plugininstall.py[12279]: log-output -t ubiquity umount /target/cdrom
  Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 1869, in <module>
  Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 62, in wrapper
  Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 192, in run
  Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 506, in configure_plugins
  Oct 30 19:38:12 ubuntu plugininstall.py[12279]:   File "/usr/share/ubiquity/plugininstall.py", line 482, in run_plugin
  Oct 30 19:38:12 ubuntu plugininstall.py[12279]: ubiquity.install_misc.InstallStepError: Plugin usersetup failed with code 2

  Full journalctl has been attached

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: ubiquity 25.10.4
  ProcVersionSignature: Ubuntu 6.17.0-5.5-generic 6.17.0-rc7
  Uname: Linux 6.17.0-5-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 25.10.2
  CloudArchitecture: x86_64
  CloudID: nocloud
  CloudName: unknown
  CloudPlatform: nocloud
  CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud)
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 30 19:42:08 2025
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz --- quiet splash
  LiveMediaBuild: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
  ProcEnviron:
   LANG=C.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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