Public bug reported:
While investigating an issue that prevents resolute ISO images from
being promoted from pending to current, I did a manual (interactive)
install on a noble (24.04.4) KVM host with a resolute (snapshot4) KVM
guest and noticed that it ends up in a crash, reporting:
2026-03-10 07:12:14,059 ERROR root:38 finish:
subiquity/Install/install/curtin_install/run_curtin_step: FAIL:
2026-03-10 07:12:14,078 ERROR root:38 finish:
subiquity/Install/install/curtin_install: FAIL:
2026-03-10 07:12:14,078 DEBUG subiquity.common.errorreport:386 generating
crash report
2026-03-10 07:12:14,150 INFO subiquity.common.errorreport:412 saving crash
report 'curthooks crashed with CurtinInstallError' to
/var/crash/1773126734.083451986.install_fail.crash
2026-03-10 07:12:14,150 ERROR root:38 finish: subiquity/Install/install: FAIL:
2026-03-10 07:12:14,150 INFO root:38 start:
subiquity/ErrorReporter/1773126734.083451986.install_fail/add_info:
2026-03-10 07:12:14,150 ERROR subiquity.server.server:536 top level error
Traceback (most recent call last):
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py",
line 249, in run_curtin_step
await run_curtin_command(
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/curtin.py",
line 244, in run_curtin_command
return await cmd.wait(input=input)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/curtin.py",
line 125, in wait
result = await self.runner.wait(self.proc, input=input)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/runner.py",
line 112, in wait
raise subprocess.CalledProcessError(
subprocess.CalledProcessError: Command '['systemd-run', '--wait',
'--same-dir', '--property', 'SyslogIdentifier=subiquity_log.1554', '--setenv',
'PATH=/snap/subiquity/7096/bin:/snap/subiquity/7096/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/subiquity/7096/bin:/snap/subiquity/7096/sbin',
'--setenv', 'PYTHONPATH=:/snap/subiquity/7096/lib/python3.12/site-packages',
'--setenv', 'PYTHON=/snap/subiquity/7096/usr/bin/python3.12', '--setenv',
'SNAP=/snap/subiquity/7096', '--', '/snap/subiquity/7096/usr/bin/python3.12',
'-m', 'curtin', '--showtrace', '-vvv', '--set', 'json:reporting={"subiquity":
{"type": "journald", "identifier": "curtin_event.1554.9"}}', '-c',
'/var/log/installer/curtin-install/subiquity-curthooks.conf', 'install',
'--set', 'json:stages=["curthooks"]']' returned non-zero exit status 1.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/shutdown.py",
line 72, in _wait_install
await self.app.controllers.Install.install_task
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py",
line 165, in decorated_async
return await meth(self, **kw)
^^^^^^^^^^^^^^^^^^^^^^
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py",
line 642, in install
await self.curtin_install(context=context, source=for_install_path)
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py",
line 165, in decorated_async
return await meth(self, **kw)
^^^^^^^^^^^^^^^^^^^^^^
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py",
line 460, in curtin_install
await run_curtin_step(
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py",
line 362, in run_curtin_step
await self.run_curtin_step(
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquitycore/context.py",
line 165, in decorated_async
return await meth(self, **kw)
^^^^^^^^^^^^^^^^^^^^^^
File
"/snap/subiquity/7096/lib/python3.12/site-packages/subiquity/server/controllers/install.py",
line 260, in run_curtin_step
raise CurtinInstallError(stages=stages)
subiquity.server.controllers.install.CurtinInstallError
2026-03-10 07:12:14,161 INFO root:38 finish: subiquity/Meta/status_GET:
SUCCESS: 200 {"state": "ERROR", "confirming_tty": "/dev/ttysclp0", "error":
{"state": "INC...
InstallerServerLogInfo:
I'm attaching the full /var/crash and /var/log folders.
(btw. the logs seem to be much bigger than usual, not sure if something changed
recently ...)
** Affects: ubuntu-z-systems
Importance: Critical
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Affects: subiquity (Ubuntu)
Importance: Critical
Status: New
** Tags: s390x ubuntu-26.04
** Attachment added: "ubu-vm-01_10.03.2026.tgz"
https://bugs.launchpad.net/bugs/2143803/+attachment/5951165/+files/ubu-vm-01_10.03.2026.tgz
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Importance: Undecided => Critical
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
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https://bugs.launchpad.net/bugs/2143803
Title:
Installation of resolute KVM guest crashed
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