Public bug reported:
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.
** Affects: ubuntu-z-systems
Importance: Medium
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Affects: subiquity (Ubuntu)
Importance: Medium
Status: New
** Tags: s390x snapshot4 ubuntu-26.04
** Attachment added: "logs-27.02.2026.tgz"
https://bugs.launchpad.net/bugs/2142839/+attachment/5948864/+files/logs-27.02.2026.tgz
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Importance: Undecided => Medium
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
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https://bugs.launchpad.net/bugs/2142839
Title:
crash during installer update while installing 26.04 snapshot4 (on
s390x)
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