Public bug reported:
How to reproduce:-
Install Ubuntu 18.04 LTS server edition
apt-get update
apt-get upgrade
apt-get install xorg lxqt sddm xfwm4
reboot
desktop will start but no task manager, start menu or panels.
if sddm is uninstalled and slim installed then the desktop works
@t470:~$ lsb_release -rd
Description: Ubuntu 18.04 LTS
Release: 18.04
philip@t470:~$ dpkg -l |grep xfwm
ii xfwm4 4.12.4-0ubuntu1
amd64 window manager of the Xfce project
philip@t470:~$ dpkg -l |grep lxqt
ii liblxqt-globalkeys-ui0:amd64 0.12.0-3ubuntu1
amd64 daemon used to register global keyboard shortcuts (ui files)
ii liblxqt-globalkeys0:amd64 0.12.0-3ubuntu1
amd64 daemon used to register global keyboard shortcuts (shared libs)
ii liblxqt-l10n 0.12.0-4ubuntu1
all Language package for liblxqt
ii liblxqt0:amd64 0.12.0-5
amd64 Shared libraries for LXQt desktop environment (libs)
ii lxqt:amd64 25
amd64 Metapackage for LXQt
ii lxqt-about 0.12.0-4
amd64 About screen for LXQt
ii lxqt-about-l10n 0.12.0-4ubuntu1
all Language package for lxqt-about
ii lxqt-admin 0.12.0-4
amd64 Admin tools for LXQt
ii lxqt-admin-l10n 0.12.0-4ubuntu1
all Language package for lxqt-admin
ii lxqt-config 0.12.0-3
amd64 LXQt system settings center
ii lxqt-config-l10n 0.12.0-4ubuntu1
all Language package for lxqt-config
ii lxqt-core 25
all Metapackage for the LXQt core
ii lxqt-globalkeys 0.12.0-3ubuntu1
amd64 daemon used to register global keyboard shortcuts (appl.)
ii lxqt-globalkeys-l10n 0.12.0-4ubuntu1
all Language package for lxqt-globalkeys
ii lxqt-notificationd 0.12.0-3
amd64 LXQt notification daemon
ii lxqt-notificationd-l10n 0.12.0-4ubuntu1
all Language package for lxqt-notificationd
ii lxqt-openssh-askpass 0.12.0-3
amd64 OpenSSH user/password GUI dialog for LXQt
ii lxqt-openssh-askpass-l10n 0.12.0-4ubuntu1
all Language package for lxqt-openssh-askpass
ii lxqt-panel 0.12.0-8ubuntu1
amd64 LXQt desktop panel
ii lxqt-panel-l10n 0.12.0-4ubuntu1
all Language package for lxqt-panel
ii lxqt-policykit 0.12.0-3
amd64 LXQt authentication agent for PolicyKit
ii lxqt-policykit-l10n 0.12.0-4ubuntu1
all Language package for lxqt-policykit
ii lxqt-powermanagement 0.12.0-4
amd64 power management module for LXQt
ii lxqt-powermanagement-l10n 0.12.0-4ubuntu1
all Language package for lxqt-powermanagement
ii lxqt-qtplugin:amd64 0.12.0-6ubuntu3
amd64 LXQt system integration plugin for Qt
ii lxqt-runner 0.12.0-4ubuntu1
amd64 LXQt program launcher
ii lxqt-runner-l10n 0.12.0-4ubuntu1
all Language package for lxqt-runner
ii lxqt-session 0.12.0-5
amd64 session manager component for LXQt
ii lxqt-session-l10n 0.12.0-4ubuntu1
all Language package for lxqt-session
ii lxqt-sudo 0.12.0-3
amd64 Graphical QT frontend for plain sudo
ii lxqt-sudo-l10n 0.12.0-4ubuntu1
all Language package for lxqt-sudo
ii lxqt-system-theme 0.12.0-3
all System theme for LXQt
ii lxqt-themes 0.12.0-3
all Themes for LXQt
philip@t470:~$ dpkg -l |grep sddm
ii sddm 0.17.0-1ubuntu7
amd64 modern display manager for X11
ii sddm-theme-debian-maui 0.17.0-1ubuntu7
all 'Debian Maui' theme for SDDM X11 display manager
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: sddm 0.17.0-1ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: LXQt
Date: Thu Jul 12 12:18:04 2018
SourcePackage: sddm
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: sddm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic uec-images
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https://bugs.launchpad.net/bugs/1781392
Title:
sddm will not start lxqt desktop correctly
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