[Bug 2142839] Re: crash during installer update while installing 26.04 snapshot4 (on s390x)

[Olivier Gayot]

Something is definitely going on but I can't tell what exactly, yet

Feb 27 10:52:33 ubuntu-server systemd[1]: snap.subiquity.subiquity-service.service: Main process exited, code=exited, status=1/FAILURE
Feb 27 10:52:33 ubuntu-server systemd[1]: snap.subiquity.subiquity-service.service: Failed with result 'exit-code'.
Feb 27 10:52:33 ubuntu-server systemd[1]: snap.subiquity.subiquity-service.service: Consumed 2.829s CPU time over 3.299s wall clock time, 69.2M memory peak.
Feb 27 10:52:33 ubuntu-server systemd[1]: snap.subiquity.subiquity-service.service: Scheduled restart job, restart counter is at 2.
Feb 27 10:52:33 ubuntu-server systemd[1]: Started snap.subiquity.subiquity-service.service - Service for snap application subiquity.subiquity-service.
Feb 27 10:52:33 ubuntu-server systemd[1]: Received SIGRTMIN+21 from PID 3504 (kill).
Feb 27 10:52:33 ubuntu-server subiquity.subiquity-service[3513]: setfont: ERROR kdfontop.c:212 put_font_kdfontop: Unable to load such font with such kernel version
Feb 27 10:52:33 ubuntu-server subiquity[3482]: i18n file is /snap/subiquity/7083/lib/python3.12/site-packages/subiquitycore/i18n.py
Feb 27 10:52:33 ubuntu-server subiquity[3482]: Final localedir is /snap/subiquity/7083/share/locale
Feb 27 10:52:33 ubuntu-server subiquity[3482]: switch_language en_US

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https://bugs.launchpad.net/bugs/2142839

Title:
  crash during installer update while installing 26.04 snapshot4 (on
  s390x)

Status in Ubuntu on IBM z Systems:
  New
Status in subiquity package in Ubuntu:
  New

Bug description:
  While doing a 26.04 snapshot4 test installation (on s390x) I got a notification that an installer update is available.
  While doing that the installer crash and I found the following error in the logs:

   2026-02-27 09:52:28,967 DEBUG asyncio:64 Using selector: EpollSelector
   2026-02-27 09:52:28,967 DEBUG subiquitycore.screen:128 KDGKBTYPE returned b'\x02', is_linux_tty True
   2026-02-27 09:52:29,671 DEBUG subiquity.common.errorreport:386 generating crash report
   2026-02-27 09:52:29,675 INFO subiquity.common.errorreport:412 saving crash report 'Installer UI crashed with ServerDisconnectedError' to /var/crash/1772185949.671535730.ui.crash
   2026-02-27 09:52:29,675 INFO subiquity/ErrorReporter/1772185949.671535730.ui/add_info:104 start:
  InstallerClientLogInfo:
   2026-02-27 09:52:28,966 INFO subiquity:134 Starting Subiquity TUI revision 7083 of snap /snap/subiquity/7083
   2026-02-27 09:52:28,966 INFO subiquity:135 Arguments passed: ['/snap/subiquity/7083/usr/bin/subiquity']
   2026-02-27 09:52:29,675 INFO subiquity.common.errorreport:412 saving crash report 'Installer UI crashed with ServerDisconnectedError' to /var/crash/1772185949.671535730.ui.crash
   2026-02-27 09:52:29,675 INFO subiquity/ErrorReporter/1772185949.671535730.ui/add_info:104 start:
  InstallerJournal:

  I'm attaching entire /var/crash and /var/log.

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