Installer ends up in infinite loop ("preparing ubuntu")

[tomas lessy]

`/snap/ubuntu-desktop-installer/939/bin/subiquity-server: line 31: 24805 Segmentation fault`

seems like some fuckup. Problem arises some time after installer is launched.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: subiquity (unknown)
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.480
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 5 14:11:20 2023
DesktopInstallerRev: 939
LiveMediaBuild: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: subiquity
Symptom: installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Reece (reece)]

Yep, me too.

System is Dell Precision 5570, trying to install Ubuntu 23.04 via iso on USB. I booted with safe mode graphics. (The try or install option appears to hang for at least 30 minutes.)

syslog (attached) has python segfaults (excerpt below). It appears that subiquity is immediately retrying after the segfault. Notice the restart counter at 110.

2023-08-02T23:53:24.571584+00:00 ubuntu kernel: [ 561.155620] python3.10[64164]: segfault at 1 ip 00007f10690b8720 sp 00007fff0fffd3f0 error 4 in _nl80211.cpython-310-x86_64-linux-gnu.so[7f10690b8000+2000] likely on CPU 13 (core 25, socket 0)
2023-08-02T23:53:24.571593+00:00 ubuntu kernel: [ 561.155636] Code: 25 bd 4a 00 00 0f 1f 44 00 00 f3 0f 1e fa f2 ff 25 b5 4a 00 00 0f 1f 44 00 00 f3 0f 1e fa f2 ff 25 ad 4a 00 00 0f 1f 44 00 00 <0f> b6 04 25 01 00 00 00 0f 0b 66 0f 1f 44 00 00 48 8d 3d 01 4e 00
2023-08-02T23:53:24.664072+00:00 ubuntu ubuntu-desktop-installer.subiquity-server[64142]: /snap/ubuntu-desktop-installer/939/bin/subiquity-server: line 31: 64164 Segmentation fault (core dumped) $PYTHON -m subiquity.cmd.server "${args[@]}"
2023-08-02T23:53:24.664207+00:00 ubuntu systemd[1]: snap.ubuntu-desktop-installer.subiquity-server.service: Main process exited, code=exited, status=139/n/a
2023-08-02T23:53:24.664249+00:00 ubuntu systemd[1]: snap.ubuntu-desktop-installer.subiquity-server.service: Failed with result 'exit-code'.
2023-08-02T23:53:24.664622+00:00 ubuntu systemd[1]: snap.ubuntu-desktop-installer.subiquity-server.service: Consumed 2.783s CPU time.
2023-08-02T23:53:24.879987+00:00 ubuntu systemd[1]: snap.ubuntu-desktop-installer.subiquity-server.service: Scheduled restart job, restart counter is at 110.

[Reece (reece)]

P.S. I had no trouble installing Ubuntu 22.10 on the same machine, so this seems like a regression.

[tomas lessy (limenius)]

Problem is present in ubuntu 23 iso image. I used ubuntu 22 and it handled installation ok.

[Reece (reece)]

Very similar bug to one in 24.04 at https://bugs.launchpad.net/ubuntu-desktop-provision/+bug/2064052

[Michal Michaláč (milac-5467)]

Same problem at NUC13ANK. Fixed by disabling WiFi in BIOS.

error 4 in "_nl80211.cpython-310-x86_64-linux-gnu.so" looks like 802.11 (WiFi) related.