I'm using XUbuntu 18.04 LTS 32bits along with Kwin instead of xfwm4.
The Cover Switch and the Flip Switch effects are not working.
Moreover, the "Desktop Cube Animation" and "Desktop Cube" effects are not available in the systemsettings5/Desktop Behavior/Desktop Effects setting window :
Here's some info. :
$ pgrep -a kwin
31882 kwin --replace
$ kcmshell5 kcm_kwin_effects
Could not find module 'kcm_kwin_effects'. See kcmshell5 --list for the full list of modules.
$ echo $?
255
$ kcmshell5 --list | grep kcm_kwin_effects
$
$ dpkg -l | grep kwin
ii kde-window-manager 4:5.12.9.1-0ubuntu0.1 all transitional package for kwin-x11
ii kwin 4:5.12.9.1-0ubuntu0.1 all Transitional dummy for kwin-x11
ii kwin-addons 4:5.12.9-0ubuntu0.1 i386 additional desktop and window switchers for KWin
ii kwin-common:i386 4:5.12.9.1-0ubuntu0.1 i386 KDE window manager, common files
ii kwin-data 4:5.12.9.1-0ubuntu0.1 all KDE window manager data files
ii kwin-style-breeze 4:5.12.8-0ubuntu0.1 i386 KWin Breeze Style
ii kwin-style-qtcurve 1.8.14-3 i386 QtCurve window decoration for KWin
ii kwin-x11 4:5.12.9.1-0ubuntu0.1 i386 KDE window manager, X11 version
ii libkwin4-effect-builtins1:i386 4:5.12.9.1-0ubuntu0.1 i386 KDE window manager effect builtins library
ii libkwineffects11:i386 4:5.12.9.1-0ubuntu0.1 i386 KDE window manager effects library
ii libkwinglutils11:i386 4:5.12.9.1-0ubuntu0.1 i386 KDE window manager gl utils library
ii libkwinxrenderutils11:i386 4:5.12.9.1-0ubuntu0.1 i386 KDE window manager render utils library
ii qml-module-org-kde-kwindowsystem:i386 5.44.0-0ubuntu3 i386 provides integration of QML and KDE frameworks - kwindowsystem
$ dpkg -l | grep "^ii\s*kde"
ii kde-baseapps 4:17.08.3+5.100ubuntu2 i386 base applications from the official KDE release (metapackage)
ii kde-baseapps-data 4:16.04.3-0ubuntu1 all shared data files for the KDE base applications
ii kde-cli-tools 4:5.12.8-0ubuntu0.1 i386 tools to use KDE services from the command line
ii kde-cli-tools-data 4:5.12.8-0ubuntu0.1 all tools to use kioslaves from the command line
ii kde-config-gtk-style 4:5.12.8-0ubuntu0.1 i386 KDE configuration module for GTK+ 2.x and GTK+ 3.x styles selection
ii kde-config-gtk-style-preview 4:5.12.8-0ubuntu0.1 i386 KDE configuration module for GTK+ 2.x and GTK+ 3.x styles selection (extras)
ii kde-config-screenlocker 5.12.8-0ubuntu0.1 i386 KCM Module for kscreenlocker
ii kde-config-sddm 4:5.12.7-0ubuntu0.1 i386 KCM module for SDDM
ii kde-config-tablet 2.0-2 i386 implements a KDE configuration GUI for the Wacom drivers
ii kde-config-telepathy-accounts 4:17.12.3-0ubuntu1 i386 KDE Control Module for managing Telepathy Accounts
ii kde-config-whoopsie 15.10ubuntu2 i386 Configuration for Whoopsie
ii kde-l10n-engb 4:17.08.3-0ubuntu4 all en_GB (engb) localization for KDE
ii kde-runtime 4:17.08.3-0ubuntu1 i386 runtime components from the official KDE release
ii kde-runtime-data 4:17.08.3-0ubuntu1 all shared data files for the KDE base runtime module
ii kde-spectacle 17.12.3-0ubuntu1 i386 Screenshot capture utility, replaces KSnapshot
ii kde-style-breeze 4:5.12.8-0ubuntu0.1 i386 Widget style for Qt and KDE Software
ii kde-style-breeze-qt4 4:5.12.8-0ubuntu0.1 i386 Widget style for Qt 4 and KDE Software
ii kde-style-oxygen 4:5.12.8-0ubuntu0.1 all transitional dummy package
ii kde-style-oxygen-qt4 4:5.12.8-0ubuntu0.1 i386 Qt 4 decoration for the Oxygen desktop theme
ii kde-style-oxygen-qt5 4:5.12.8-0ubuntu0.1 i386 Qt decoration for the Oxygen desktop theme
ii kde-style-qtcurve-qt4:i386 1.8.18+git20160320-3d8622c-5build4 i386 QtCurve widget style for applications based on Qt 4.x
ii kde-style-qtcurve-qt5:i386 1.8.18+git20160320-3d8622c-5build4 i386 QtCurve widget style for applications based on Qt 5.x
ii kde-telepathy-approver 4:17.12.3-0ubuntu1 i386 KDED module for approving incoming conversations
ii kde-telepathy-auth-handler 4:17.12.3-0ubuntu1 i386 KDE Telepathy authentication handler
ii kde-telepathy-contact-list 4:17.12.3-0ubuntu1 i386 Telepathy contact list for the KDE Plasma Desktop
ii kde-telepathy-data 4:17.12.3-0ubuntu1 all Shared data for all the KDE Telepathy components
ii kde-telepathy-desktop-applets 4:17.12.3-0ubuntu1 i386 KDE Telepathy contact plasmoid
ii kde-telepathy-integration-module 4:17.12.3-0ubuntu1 i386 Telepathy integration module for the KDE Workspace
ii kde-telepathy-kaccounts 4:17.12.3-0ubuntu1 i386 kaccounts plugins for kde-telepathy
ii kde-telepathy-kpeople 4:17.12.3-0ubuntu1 i386 kpeople plugins for kde-telepathy
ii kde-telepathy-send-file 4:17.12.3-0ubuntu1 i386 KDE Telepathy dolphin/konqueror integration plugin
ii kde-window-manager 4:5.12.9.1-0ubuntu0.1 all transitional package for kwin-x11
ii kdeconnect 1.3.3-0ubuntu0.18.04.1 i386 connect smartphones to your KDE Plasma Workspace
ii kded5 5.44.0-0ubuntu1 i386 Extensible daemon for providing session services
ii kdegraphics-thumbnailers 4:17.12.3-0ubuntu1 i386 graphics file format thumbnailers for KDE SC
ii kdelibs-bin 4:4.14.38-0ubuntu3.1 i386 core executables for KDE Applications
ii kdelibs5-data 4:4.14.38-0ubuntu3.1 all core shared data for all KDE Applications
ii kdelibs5-plugins 4:4.14.38-0ubuntu3.1 i386 core plugins for KDE Applications
ii kdenetwork-filesharing 4:17.12.3-0ubuntu1 i386 network filesharing configuration module
ii kdeplasma-addons-data 4:5.12.9-0ubuntu0.1 all locale files for kdeplasma-addons
