update-manager crashed with dbus.exceptions.DBusException in update(): org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1

[Per-Inge]

Got the bug in a new install. Started software-updater the first thing after the installation.
Got 2 bugs 1904217, probably a private bug as I don't have permission o see it, and this bug.
There is also the bug 1904866, which is similar to this and also bug 1063589.

ProblemType: Crash
DistroRelease: Ubuntu 21.04
Package: update-manager 1:20.10.1
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu51
Aptdaemon:

Architecture: amd64
CasperMD5CheckResult: skip
CrashCounter: 1
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 19 14:03:40 2020
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'launch-count' b'1'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1605791019'
InstallationDate: Installed on 2020-11-19 (0 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201119)
InterpreterPath: /usr/bin/python3.8
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-1
PythonArgs: ['/usr/bin/update-manager']
PythonDetails: N/A
SourcePackage: update-manager
Title: update-manager crashed with dbus.exceptions.DBusException in update(): org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo

[Sebastien Bacher (seb128)]

Thank you for your bug report, it sounds like that could be an issue with the python 3.8 to 3.9 transition

[Per-Inge (per-inge-hallin)]

Fixed in this update

Start-Date: 2020-11-22 09:54:35
Commandline: apt upgrade
Requested-By: p-i (1000)
Upgrade: libc-ares2:amd64 (1.16.1-1ubuntu1, 1.17.1-1), libkrb5-3:amd64 (1.17-10, 1.17-10ubuntu1), libgssapi-krb5-2:amd64 (1.17-10, 1.17-10ubuntu1), mscompress:amd64 (0.4-7, 0.4-8), libcurl4:amd64 (7.68.0-1ubuntu4, 7.72.0-1ubuntu1), libk5crypto3:amd64 (1.17-10, 1.17-10ubuntu1), ubuntu-drivers-common:amd64 (1:0.8.6.1, 1:0.8.6.2), libkrb5support0:amd64 (1.17-10, 1.17-10ubuntu1), python3-dbus:amd64 (1.2.16-3, 1.2.16-4), libcurl3-gnutls:amd64 (7.68.0-1ubuntu4, 7.72.0-1ubuntu1)
End-Date: 2020-11-22 09:54:37