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

[Fabio Marconi]

It popped up that I stopped the update but I didn't.
Then apport reported

ProblemType: Crash
DistroRelease: Ubuntu 21.04
Package: update-manager 1:20.10.1
ProcVersionSignature: Ubuntu 5.8.0-26.27-generic 5.8.14
Uname: Linux 5.8.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu51
Aptdaemon:

Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Nov 14 17:30:14 2020
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/update-manager
InstallationDate: Installed on 2016-10-30 (1475 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
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 call_blocking(): 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 netdev plugdev sambashare sudo

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1063589, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.