Software Updater hangs on "Waiting for packagekitd to exit"

[peterzay]

Software Updater not used in about 2 months on this test machine.

See screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: update-manager 1:18.04.11
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Jun 23 16:49:07 2018
DpkgHistoryLog.txt:

DpkgTerminalLog.txt:

ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'645'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1529786763'
InstallationDate: Installed on 2018-05-03 (50 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180425.1)
InterpreterPath: /usr/bin/python3.6
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[peterzay (peterzay)]

Power down, boot, another execution of Software Updater solves the problem.

[Launchpad Janitor (janitor)]

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

[Rainer (r-e-l)]

This problems occurs since updating to Ubuntu 18.04. It is great to must restart Ubuntu to run the software updater.

[Mustafa Öncel (thedgofficial)]

Still happens on 21.04. sudo systemctl stop <pid of packagekitd> fixes it temporarily on my system. Restarting the computer did not help by the way. Packagekitd was always starting at boot, not sure why. It works sometimes though, not much critical and can be fixed by stopping packagekitd but it always frustrates me. Maybe packagekitd should get some sort of timeout or such? Don't know much about what it does.