unattended-upgrade crashed with apt.cache.LockFailedException in _fetch_archives(): Failed to lock /var/cache/apt/archives/lock

[Bernard Tatin]

I am unable to tell you how this happened, I just saw the application which reports bugs logo in the task bar.

ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: unattended-upgrades 0.98ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
Date: Sat Oct 21 06:25:37 2017
ExecutablePath: /usr/bin/unattended-upgrade
InstallationDate: Installed on 2017-03-23 (213 days ago)
InstallationMedia: budgie-remix 16.10 "Budgie-remix" - amd64 (20161013)
InterpreterPath: /usr/bin/python3.6
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/unattended-upgrade
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
PythonArgs: ['/usr/bin/unattended-upgrade']
PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
SourcePackage: unattended-upgrades
Title: unattended-upgrade crashed with apt.cache.LockFailedException in _fetch_archives(): Failed to lock /var/cache/apt/archives/lock
UpgradeStatus: Upgraded to artful on 2017-10-20 (2 days ago)
UserGroups:

[Launchpad Janitor (janitor)]

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