install successful but crashed with CalledProcessError - subiquity 290

[corrado venturini]

Try install from ISO Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220212)
ubuntu-desktop-installer 0+git.55a8a8c 2022-02-10 (290)
on my desktop
Machine:
  Type: Desktop Mobo: Gigabyte model: H87M-D3H v: x.x
    serial: <superuser required> UEFI: American Megatrends v: F3
    date: 04/24/2013
CPU:
  Info: dual core model: Intel Core i3-4130 bits: 64 type: MT MCP
    arch: Haswell rev: 3 cache: L1: 128 KiB L2: 512 KiB L3: 3 MiB
  Speed (MHz): avg: 798 high: 799 min/max: 800/3400 cores: 1: 799 2: 798
    3: 799 4: 799 bogomips: 27138
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel 4th Generation Core Processor Family Integrated Graphics
    vendor: Gigabyte driver: i915 v: kernel bus-ID: 00:02.0
  Display: wayland server: X.Org 1.21.1.4 compositor: gnome-shell driver:
    loaded: i915 note: n/a (using device driver) resolution: 1680x1050~60Hz
  OpenGL: renderer: Mesa DRI Intel HD Graphics 4400 (HSW GT2)
    v: 4.5 Mesa 21.2.2 direct render: Yes

boot from USB key
select try Ubuntu
connect to internet wifi using hotspot on smartphone
changed keyboard from english to italian
started firefox and try gmail: OK
refresh ubuntu-desktop-installer --edge from 288 to 290
started installer from terminal
taken screenshot of all screens
the slideshow does not proceed after 1St slide
the last screen of the slideshow says:
something went wrong please restart...
a small window asking if sumbit error, reply yes but nothing happens
crash file created in /var/crash
open crash file with 'report a problem'
I see the windows about the problem (screenshots in Pictures.zip)
and the 1St says: install failed crashed with CalledProcessError
click on 'Send' to send problem to developers
I have a window saying:
Problem in subiquity
the problem cannot be reported
this problem report is damaged and cannot be processed
PermissionError(1,'operation not permitted')

restarting the system I have a working system so where is the error?

attached:
crash.zip from /var/crash
log.zip from /var/log
Pictures.zip with screeshots taken

[corrado venturini (corradoventu)]

attaching log.zip

[corrado venturini (corradoventu)]

attaching Pictures.zip with screenshot of the install windows and of the bug

[corrado venturini (corradoventu)]

From /log/curtin/install.log install seems ok (and is ok because the generated system works fine)
finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/install-grub: SUCCESS: installing grub to target devices
finish: cmd-install/stage-curthooks/builtin/cmd-curthooks/configuring-bootloader: SUCCESS: configuring target system bootloader
finish: cmd-install/stage-curthooks/builtin/cmd-curthooks: SUCCESS: curtin command curthooks
start: cmd-install/stage-hook/builtin/cmd-hook: curtin command hook
Finalizing /target
finish: cmd-install/stage-hook/builtin/cmd-hook: SUCCESS: curtin command hook
curtin: Installation finished.

but from terminal output i see an error:
flutter: INFO subiquity_client: state: POST_RUNNING => UU_RUNNING
flutter: DEBUG subiquity_client: GET http://localhost/meta/status?cur=%22UU_RUNNING%22
flutter: DEBUG subiquity_client: ==> status("UU_RUNNING") {"state": "ERROR", "confirming_tty": "/dev/tty1", "error": {"state": "INCOMPLETE", "base": "1644671289.296469450.install...
flutter: INFO subiquity_client: state: UU_RUNNING => ERROR

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dan Bungert (dbungert)]

The error in this case was during unattended-upgrades. I suppose that doesn't need to be a fatal error - unattended upgrades is one of the last steps and the system is, as noted, otherwise fine.
So that explains why the system was usable, but not why unattended-upgrades failed.