Is it possible to auto-start a Desktop Effect after login?

[ShadYoung]

You are mistaken
That is not true at all.

apt search returns hundreds of items starting with kmajong - I did not install kmajong, I do not play majong. It was automatic. Most of it is widgets to config data, to jsapi. I did not install any widgets, I just use the ones that are there.

Here is a list of snaps:

snap list
Name                                  Version                     Rev    Tracking         Publisher   Notes
bare                                         1.0                         5       latest/stable    canonical   base
core18                                20220831                  2566   latest/stable    canonical  base
core20                                20220826                  1623   latest/stable    canonical  base
gnome-3-28-1804 3.28.0-19-g98f9e67.98f9e67  161    latest/stable    canonical
gnome-3-38-2004            0+git.6f39565               119    latest/stable/…  canonical
gtk-common-themes     0.1-81-g442e511             1535   latest/stable/…  canonical
kde-frameworks-5-91-qt-5-15-3-core20  5.91.0                      1      latest/stable    kde
kde-frameworks-5-96-qt-5-15-5-core20  5.96.0                      7      latest/stable    kde
snapd                                 2.57.4                      17336  latest/stable    canonical  snapd​

I did not intentionally install kdeframeworks, especially as a snap. A clean install is not relevant, its what happens when you use it. I am not doing anything odd. Just normal stuff. There is nothing particularly weird or unusual. Most apps I use are appimages anyway. The system got this way just by reglar configurations.

[claydoh]

You must same a small elf or demon doing it then, as Kubuntu is most definitely NOT doing this to you.

In any case, the snap you have still has ZERO to do with your system's frameworks packages whatsoever, which you can check with the command I gave to list installed packages that include the string kf5. Here is mine:

$ apt search kf5 | grep installed

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

baloo-kf5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
frameworkintegration/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
kdegames-card-data-kf5/jammy,jammy,now 4:21.12.3-1ubuntu1 all [installed,automatic]
kdegames-mahjongg-data-kf5/jammy,jammy,now 4:21.12.3-0ubuntu1 all [installed,automatic]
libcolorcorrect5/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
libkf5activities5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5activitiesstats1/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5archive5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5attica5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5auth-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5auth5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5authcore5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5baloo5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5balooengine5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5baloowidgets-bin/jammy,now 4:21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5baloowidgets-data/jammy,jammy,now 4:21.12.3-0ubuntu1 all [installed,automatic]
libkf5baloowidgets5/jammy,now 4:21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5bluezqt-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5bluezqt6/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5bookmarks-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5bookmarks5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5calendarevents5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5cddb5/jammy,now 4:21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5codecs-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5codecs5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5compactdisc5/jammy,now 4:21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5completion-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5completion5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5config-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5config-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5configcore5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5configgui5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5configwidgets-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5configwidgets5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5contacts-data/jammy,jammy,now 5:5.92.0-0ubuntu1 all [installed,automatic]
libkf5contacts5/jammy,now 5:5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5coreaddons-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5coreaddons5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5crash5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5dbusaddons-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5dbusaddons-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5dbusaddons5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5declarative-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5declarative5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5dnssd-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5dnssd5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5doctools5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5filemetadata-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5filemetadata-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5filemetadata3/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5globalaccel-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5globalaccel-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5globalaccel5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5globalaccelprivate5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5guiaddons-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5guiaddons-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5guiaddons5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5holidays-data/jammy,jammy,now 1:5.92.0-0ubuntu1 all [installed,automatic]
libkf5holidays5/jammy,now 1:5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5i18n-data/jammy,jammy,now 5.92.0-0ubuntu2 all [installed,automatic]
libkf5i18n5/jammy,now 5.92.0-0ubuntu2 amd64 [installed,automatic]
libkf5i18nlocaledata5/jammy,now 5.92.0-0ubuntu2 amd64 [installed,automatic]
libkf5iconthemes-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5iconthemes-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5iconthemes5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5idletime5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5itemmodels5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5itemviews-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5itemviews5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5jobwidgets-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5jobwidgets5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5js5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5jsapi5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kcmutils-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5kcmutils5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kdcraw5/jammy,now 21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5kdegames-data/jammy,jammy,now 4:21.12.3-1ubuntu1 all [installed,automatic]
libkf5kdegames7/jammy,now 4:21.12.3-1ubuntu1 amd64 [installed,automatic]
libkf5kdegamesprivate7/jammy,now 4:21.12.3-1ubuntu1 amd64 [installed,automatic]
libkf5kdelibs4support-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5kdelibs4support5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kdelibs4support5-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kexiv2-15.0.0/jammy,now 21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5khtml-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5khtml-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5khtml5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kiocore5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kiofilewidgets5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kiogui5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kiontlm5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kiowidgets5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5kipi-data/jammy,jammy,now 4:21.12.3-0ubuntu1 all [installed,automatic]
libkf5kipi32.0.0/jammy,now 4:21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5kirigami2-5/jammy,now 5.92.0-0ubuntu2 amd64 [installed,automatic]
libkf5kmahjongglib5/jammy,now 4:21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5krosscore5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5krossui5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5modemmanagerqt6/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5networkmanagerqt6/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5newstuff-data/jammy-updates,jammy-updates,now 5.92.0-0ubuntu1.1 all [installed,automatic]
libkf5newstuff5/jammy-updates,now 5.92.0-0ubuntu1.1 amd64 [installed,automatic]
libkf5newstuffcore5/jammy-updates,now 5.92.0-0ubuntu1.1 amd64 [installed,automatic]
libkf5notifications-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5notifications5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5notifyconfig-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5notifyconfig5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5package-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5package5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5parts-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5parts-plugins/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5parts5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5people-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5people5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5peoplebackend5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5peoplewidgets5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5plasma5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5plasmaquick5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5plotting5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5prison5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5pty-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5pty5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5pulseaudioqt3/jammy,now 1.3-2 amd64 [installed,automatic]
libkf5purpose-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5purpose5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5quickaddons5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5runner5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5sane-data/jammy,jammy,now 21.12.3-0ubuntu1 all [installed,automatic]
libkf5sane5/jammy,now 21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5screen-bin/jammy,now 4:5.24.4-0ubuntu1 amd64 [installed,automatic]
libkf5screen7/jammy,now 4:5.24.4-0ubuntu1 amd64 [installed,automatic]
libkf5service-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5service-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5service5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5solid5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5solid5-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5sonnet5-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5sonnetcore5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5sonnetui5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5style5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5su-bin/jammy-updates,now 5.92.0-0ubuntu1.1 amd64 [installed,automatic]
libkf5su-data/jammy-updates,jammy-updates,now 5.92.0-0ubuntu1.1 all [installed,automatic]
libkf5su5/jammy-updates,now 5.92.0-0ubuntu1.1 amd64 [installed,automatic]
libkf5syndication5abi1/jammy,now 1:5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5syntaxhighlighting-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5syntaxhighlighting5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5sysguard-data/jammy-updates,jammy-updates,now 4:5.24.6-0ubuntu0.1 all [installed,automatic]
libkf5texteditor-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5texteditor5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5textwidgets-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5textwidgets5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5threadweaver5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5torrent6abi1/jammy,now 21.12.3-0ubuntu1 amd64 [installed,automatic]
libkf5unitconversion-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5unitconversion5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5wallet-bin/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5wallet-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5wallet5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5waylandclient5/jammy,now 4:5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5waylandserver5/jammy,now 4:5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5widgetsaddons-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5widgetsaddons5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5windowsystem-data/jammy,jammy,now 5.92.0-0ubuntu1 all [installed,automatic]
libkf5windowsystem5/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
libkf5xmlgui-bin/jammy,now 5.92.0-0ubuntu2 amd64 [installed,automatic]
libkf5xmlgui-data/jammy,jammy,now 5.92.0-0ubuntu2 all [installed,automatic]
libkf5xmlgui5/jammy,now 5.92.0-0ubuntu2 amd64 [installed,automatic]
libkworkspace5-5/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
libnotificationmanager1/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
libpam-kwallet5/jammy,now 4:5.24.4-0ubuntu1 amd64 [installed,automatic]
libplasma-geolocation-interface5/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
libreoffice-kf5/jammy-updates,jammy-security,now 1:7.3.6-0ubuntu0.22.04.2 amd64 [installed,automatic]
libreoffice-plasma/jammy-updates,jammy-security,now 1:7.3.6-0ubuntu0.22.04.2 amd64 [installed,automatic]
libtaskmanager6/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
libweather-ion7/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
plasma-framework/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
plasma-workspace/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]
plasma-workspace-data/jammy-updates,jammy-updates,now 4:5.24.6-0ubuntu0.1 all [installed,automatic]
qml-module-org-kde-activities/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
qml-module-org-kde-kcm/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
qml-module-org-kde-kconfig/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
qml-module-org-kde-kcoreaddons/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
qml-module-org-kde-kio/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
qml-module-org-kde-kquickcontrolsaddons/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
qml-module-org-kde-kwindowsystem/jammy,now 5.92.0-0ubuntu1 amd64 [installed,automatic]
sddm-theme-breeze/jammy-updates,now 4:5.24.6-0ubuntu0.1 amd64 [installed,automatic]

KDE Games, including KMahjongg, is part of a default Kubuntu install


You can remove those KDE snaps, as well as the gnome-3-28-1804 and the core18, as you don't have any Snaps installed that depend on these anymore.