I filled this bug against plasma-desktop because I don't know which
package upgrade cause the error. However monday I upgraded my plasma
desktop and it removed almost all of KDE.

I'll add what has been done in attachment.

Upgrade: libqt5webengine-data:amd64 (5.15.8+dfsg-1, 5.15.10+dfsg-1),
qtspeech5-flite-plugin:amd64 (5.15.2-2, 5.15.4-2), libcurl4:amd64
(7.83.1-1+b1, 7.83.1-2), libqt5websockets5:amd64 (5.15.2
-2, 5.15.4-2), udev:amd64 (250.4-1, 251.2-5), libcurl3-gnutls:amd64 
(7.83.1-1+b1,
  7.83.1-2), libqt5serialport5:amd64 (5.15.2-2, 5.15.4-2), libwww-perl:amd64
(6.66-1, 6.67-1), libqt5quickcontrols2-5:amd64 (5.15.2+dfsg-4,
5.15.4+dfsg-2), systemd-timesyncd:amd64 (250.4-1, 251.2-5),
libqt5quickwidgets5:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
libqt5networkauth5:amd64 (5.15.2-2, 5.15.4-2),
qml-module-qtquick-shapes:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
libqt5positioning5:amd64 (5.15.2+dfsg-3+b1, 5.15.4+dfsg-2),
qml-module-qtquick-layouts:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
libpam-systemd:amd64 (250.4-1, 251.2-5), libqt5webenginewidgets5:amd64
(5.15.8+dfsg-1+b2, 5.15.10+dfsg-1), libqt5core5a:amd64 (5.15.2+dfsg-16+b2,
5.15.4+dfsg-3), libselinux1:amd64 (3.3-1+b2, 3.4-1),
qml-module-qtquick-window2:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
qt5-gtk-platformtheme:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
libqt5webchannel5:amd64 (5.15.2-2, 5.15.4-2),
python3-pyqt5.qtserialport:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
qdbus-qt5:amd64 (5.15.2-5+b1, 5.15.4-2), qml-module-qt-labs-settings:amd64
(5.15.2+dfsg-10, 5.15.4+dfsg-3), python3-pyqt5.qtopengl:amd64
(5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), libqt5script5:amd64 (5.15.2+dfsg-2,
5.15.4+dfsg-2), libqt5qml5:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
libqt5sensors5:amd64 (5.15.2-2, 5.15.4-2),
qml-module-qtquick-controls2:amd64 (5.15.2+dfsg-4, 5.15.4+dfsg-2),
libqt5quickshapes5:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
qml-module-qt-labs-platform:amd64 (5.15.2+dfsg-4, 5.15.4+dfsg-2),
libsystemd0:amd64 (250.4-1, 251.2-5), libqt5network5:amd64
(5.15.2+dfsg-16+b2, 5.15.4+dfsg-3), python3-pyqt5.qtquick:amd64
(5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), libnss-systemd:amd64 (250.4-1,
251.2-5), libqt5concurrent5:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
libqt5remoteobjects5:amd64 (5.15.2-2, 5.15.4-2),
python3-pyqt5.qtsensors:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
python3-pyqt5.qttexttospeech:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
libqt5dbus5:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
python3-pyqt5.qtxmlpatterns:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
libqt5multimedia5-plugins:amd64 (5.15.2-3, 5.15.4-2), libsepol2:amd64
(3.3-1, 3.4-2), libqt5xmlpatterns5:amd64 (5.15.2-3, 5.15.4-2),
python3-pyqt5:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), libqt5quick5:amd64
(5.15.2+dfsg-10, 5.15.4+dfsg-3), libqt5test5:amd64 (5.15.2+dfsg-16+b2,
5.15.4+dfsg-3), qtwayland5:amd64 (5.15.2-4, 5.15.4-2), systemd:amd64
(250.4-1, 251.2-5), libqt5waylandcompositor5:amd64 (5.15.2-4, 5.15.4-2),
libqt5quickparticles5:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3), libudev1:amd64
(250.4-1, 251.2-5), libqt5widgets5:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
libqt5virtualkeyboard5:amd64 (5.15.2+dfsg-2, 5.15.4+dfsg-2),
qml-module-qtmultimedia:amd64 (5.15.2-3, 5.15.4-2),
qml-module-qtwebkit:amd64 (5.212.0~alpha4-16, 5.212.0~alpha4-19),
libqt5multimediaquick5:amd64 (5.15.2-3, 5.15.4-2), libqt5gui5:amd64
(5.15.2+dfsg-16+b2, 5.15.4+dfsg-3), libqt5multimediagsttools5:amd64
(5.15.2-3, 5.15.4-2), libqt5multimedia5:amd64 (5.15.2-3, 5.15.4-2),
libssl3:amd64 (3.0.3-7, 3.0.3-8), libqt5printsupport5:amd64
(5.15.2+dfsg-16+b2, 5.15.4+dfsg-3), python3-pyqt5.qtpositioning:amd64
(5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), libqt5xml5:amd64 (5.15.2+dfsg-16+b2,
5.15.4+dfsg-3), qml-module-qtwebengine:amd64 (5.15.8+dfsg-1+b2,
5.15.10+dfsg-1), qml-module-qtquick-virtualkeyboard:amd64 (5.15.2+dfsg-2,
5.15.4+dfsg-2), libqt5opengl5:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
mawk:amd64 (1.3.4.20200120-3+b1, 1.3.4.20200120-3.1), libsemanage2:amd64
(3.3-1+b2, 3.4-1), libqt5texttospeech5:amd64 (5.15.2-2, 5.15.4-2),
libqt5webengine5:amd64 (5.15.8+dfsg-1+b2, 5.15.10+dfsg-1), rsyslog:amd64
(8.2204.1-1+b1, 8.2206.0-1), python3-pyqt5.qtwebchannel:amd64
(5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), libqt5designercomponents5:amd64
(5.15.2-5+b1, 5.15.4-2), libqt5sql5:amd64 (5.15.2+dfsg-16+b2,
5.15.4+dfsg-3), qml-module-qtgraphicaleffects:amd64 (5.15.2-2, 5.15.4-2),
qml-module-qt-labs-folderlistmodel:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
python3-pyqt5.qtmultimedia:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
libqt5svg5:amd64 (5.15.2-4, 5.15.4-2), python3-pyqt5.qtsql:amd64
(5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), python3-pyqt5.qtsvg:amd64
(5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3), oxygen-sounds:amd64 (4:5.24.90-2,
4:5.25.0-1), libqt5webkit5:amd64 (5.212.0~alpha4-16, 5.212.0~alpha4-19),
python3-pyqt5.qtwebkit:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
libqt5location5:amd64 (5.15.2+dfsg-3+b1, 5.15.4+dfsg-2),
libsemanage-common:amd64 (3.3-1, 3.4-1), libqt5multimediawidgets5:amd64
(5.15.2-3, 5.15.4-2), libogg0:amd64 (1.3.4-0.1, 1.3.5-1),
libqt5gamepad5:amd64 (5.15.2-4, 5.15.4-2), libqt5quicktemplates2-5:amd64
(5.15.2+dfsg-4, 5.15.4+dfsg-2), qml-module-qtqml-models2:amd64
(5.15.2+dfsg-10, 5.15.4+dfsg-3), qml-module-qtquick-privatewidgets:amd64
(5.15.2-2, 5.15.4-2), fonts-vlgothic:amd64 (20200720-1, 20220612-1),
qdoc-qt5:amd64 (5.15.2-5+b1, 5.15.4-2), qt5-assistant:amd64 (5.15.2-5+b1,
5.15.4-2), python3-pyqt5.qtwebsockets:amd64 (5.15.6+dfsg-1+b2,
5.15.6+dfsg-1+b3), qml-module-qt-labs-qmlmodels:amd64 (5.15.2+dfsg-10,
5.15.4+dfsg-3), qml-module-qtquick-controls:amd64 (5.15.2-2, 5.15.4-2),
qml-module-qtqml-statemachine:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
qml-module-qtquick-templates2:amd64 (5.15.2+dfsg-4, 5.15.4+dfsg-2),
libqt5sql5-sqlite:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
libqt5webenginecore5:amd64 (5.15.8+dfsg-1+b2, 5.15.10+dfsg-1),
libqt5qmlmodels5:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3), systemd-sysv:amd64
(250.4-1, 251.2-5), qtattributionsscanner-qt5:amd64 (5.15.2-5+b1, 5.15.4-2),
curl:amd64 (7.83.1-1+b1, 7.83.1-2), libqt5designer5:amd64 (5.15.2-5+b1,
5.15.4-2), qml-module-qtquick2:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
qml-module-qtquick-dialogs:amd64 (5.15.2-2, 5.15.4-2),
qhelpgenerator-qt5:amd64 (5.15.2-5+b1, 5.15.4-2),
libqt5qmlworkerscript5:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3),
libqt5sql5-mysql:amd64 (5.15.2+dfsg-16+b2, 5.15.4+dfsg-3),
libqt5waylandclient5:amd64 (5.15.2-4, 5.15.4-2),
python3-pyqt5.qtremoteobjects:amd64 (5.15.6+dfsg-1+b2, 5.15.6+dfsg-1+b3),
qttools5-dev-tools:amd64 (5.15.2-5+b1, 5.15.4-2), libdebconfclient0:amd64
(0.262, 0.263), libqt5help5:amd64 (5.15.2-5+b1, 5.15.4-2),
qml-module-qtqml:amd64 (5.15.2+dfsg-10, 5.15.4+dfsg-3), openssl:amd64
(3.0.3-7, 3.0.3-8), libqt5positioningquick5:amd64 (5.15.2+dfsg-3+b1,
5.15.4+dfsg-2), qml-module-qtquick-particles2:amd64 (5.15.2+dfsg-10,
5.15.4+dfsg-3), libqt5scripttools5:amd64 (5.15.2+dfsg-2, 5.15.4+dfsg-2)

Remove: libkf5alarmcalendar5abi1:amd64 (4:21.12.3-2), libkf5konq6:amd64
(4:21.12.3-1), breeze:amd64 (4:5.24.5-1), libkf5mailtransportakonadi5:amd64
(21.12.3-2), plasma-runners-addons:amd64 (4:5.24.5-1),
libkf5kdelibs4support5-bin:amd64 (5.94.0-1),
kde-config-telepathy-accounts:amd64 (21.12.3-1), libkf5kipi32.0.0:amd64
(4:21.12.3-1), libkf5mailimporterakonadi5:amd64 (4:21.12.3-2), kwave:amd64
(21.12.3-1), libkpimimportwizard5:amd64 (4:21.12.3-2), filelight:amd64
(4:21.12.3-1), skanlite:amd64 (21.12.3-1), kinfocenter:amd64 (4:5.24.5-1),
kwayland-integration:amd64 (5.24.5-1), libkpimitinerary5:amd64 (21.12.3-3),
libkf5parts-plugins:amd64 (5.94.0-1), kde-baseapps:amd64 (4:21.08.0+5.122),
libkf5tnef5:amd64 (4:21.12.3-2), kwordquiz:amd64 (4:21.12.3-1),
libkpimaddressbookimportexport5:amd64 (4:21.12.3-2), konq-plugins:amd64
(4:21.12.3-1), libkf5plasmaquick5:amd64 (5.94.0-1), kalzium:amd64
(4:21.12.3-1), libkf5runner5:amd64 (5.94.0-1), kblocks:amd64 (4:21.08.0-1),
ark:amd64 (4:22.04.1-1), libkf5akonadicalendar5abi1:amd64 (4:21.12.3-2),
klickety:amd64 (4:21.08.0-1), kaccounts-providers:amd64 (4:21.12.3-1),
plasma-workspace:amd64 (4:5.24.5-2), plasma-widgets-addons:amd64
(4:5.24.5-1), akregator:amd64 (4:21.12.3-2), plasma-systemmonitor:amd64
(5.24.5-1), kalgebra-common:amd64 (4:21.12.3-1),
libkf5kdelibs4support5:amd64 (5.94.0-1), svgpart:amd64 (4:21.12.3-1),
knights:amd64 (21.12.3-1), k3b:amd64 (1:22.04.2-dmo1),
pim-data-exporter:amd64 (4:21.12.3-2), libkf5kiofilewidgets5:amd64
(5.94.0-1), latte-dock:amd64 (0.10.8-1+b1), juk:amd64 (4:22.04.1-1),
kig:amd64 (4:21.12.3-1+b1), libkf5calendarsupport5abi1:amd64 (4:21.12.3-2),
klettres:amd64 (4:21.12.3-1), print-manager:amd64 (4:22.04.2-1),
kapman:amd64 (4:21.08.0-1), kde-telepathy-call-ui:amd64 (21.12.3-1),
korganizer:amd64 (4:21.12.3-2), kdegames:amd64 (4:21.08.0+5.122),
qml-module-org-kde-kirigami2:amd64 (5.94.0-1),
libkf5akonadiwidgets5abi1:amd64 (4:21.12.3-2), kscreen:amd64 (4:5.24.5-1),
kross:amd64 (5.94.0-1), kde-telepathy-contact-list:amd64 (21.12.3-1),
kmail:amd64 (4:21.12.3-2+b1), sweeper:amd64 (4:21.12.3-1), kate:amd64
(4:22.04.1-1), libkf5kdegamesprivate7:amd64 (4:21.12.3-1), kdeedu:amd64
(4:21.08.0+5.122), libkf5i18nlocaledata5:amd64 (5.94.0-1),
kde-telepathy-desktop-applets:amd64 (21.12.3-1), kwrite:amd64 (4:22.04.1-1),
kdeconnect:amd64 (21.12.3-1), kde-config-updates:amd64 (5.24.5-1),
ktexteditor-katepart:amd64 (5.94.0-2), kalgebra:amd64 (4:21.12.3-1),
kdegraphics:amd64 (4:21.08.0+5.122), libkf5kcmutils5:amd64 (5.94.0-2),
libokular5core9:amd64 (4:21.12.3-2), cantor:amd64 (4:21.12.3-1+b1),
kigo:amd64 (4:21.08.0-1), klines:amd64 (4:21.08.0-1), systemsettings:amd64
(4:5.24.5-1), plasma-wallpapers-addons:amd64 (4:5.24.5-1), ksnakeduel:amd64
(4:21.08.0-1), ksudoku:amd64 (4:21.08.0-1),
kde-telepathy-integration-module:amd64 (21.12.3-1),
libk3b7-extracodecs:amd64 (1:22.04.2-dmo1),
kde-telepathy-filetransfer-handler:amd64 (21.12.3-1), kmag:amd64
(4:21.12.3-1), gwenview:amd64 (4:22.04.1-1), libweather-ion7:amd64
(4:5.24.5-2), kubrick:amd64 (4:21.08.0-1), kde-standard:amd64 (5:122),
qml-module-org-kde-telepathy:amd64 (21.12.3-1), dragonplayer:amd64
(4:22.04.1-1), kolf:amd64 (4:21.08.0-1), kmines:amd64 (4:21.08.0-1),
kpat:amd64 (4:21.08.0-1), libkf5messagecomposer5abi1:amd64 (4:21.12.3-2+b1),
krdc:amd64 (4:21.12.3-1), libkf5akonadisearch-bin:amd64 (4:21.12.3-2),
libpowerdevilcore2:amd64 (4:5.24.5-1), kfourinline:amd64 (4:21.08.0-1),
libkpimgapicontacts5:amd64 (21.12.3-2), layer-shell-qt:amd64 (5.24.5-1),
libkf5newstuff5:amd64 (5.94.0-2), kio-extras:amd64 (4:21.12.3-1),
kmailtransport-akonadi:amd64 (21.12.3-2), kgoldrunner:amd64 (4:21.08.0-1),
ksirk:amd64 (4:21.08.0-1), libkasten4okteta2gui0:amd64 (5:0.26.9-1),
plasma-runner-telepathy-contact:amd64 (21.12.3-1), kbounce:amd64
(4:21.08.0-1), bomber:amd64 (4:21.08.0-1), katomic:amd64 (4:21.08.0-1),
knavalbattle:amd64 (4:21.08.0-1), libkasten4okteta2controllers0:amd64
(5:0.26.9-1), kde-config-screenlocker:amd64 (5.24.5-1), kcalc:amd64
(4:22.04.1-1), okteta:amd64 (5:0.26.9-1), libkf5xmlgui5:amd64 (5.94.0-1),
powerdevil:amd64 (4:5.24.5-1), kalarm:amd64 (4:21.12.3-2),
libkf5webengineviewer5abi1:amd64 (4:21.12.3-2+b1), lskat:amd64
(4:21.08.0-1), kde-telepathy-text-ui:amd64 (21.12.3-1),
libkf5messagecore5abi1:amd64 (4:21.12.3-2+b1), kdiamond:amd64 (4:21.12.3-1),
kpart5-kompare:amd64 (4:21.12.3-1), kipi-plugins:amd64 (4:21.12.3-1),
kgeography:amd64 (4:21.12.3-1), libkasten4gui0:amd64 (5:0.26.9-1),
kdenlive:amd64 (1:22.04.2-dmo1), libkf5parts5:amd64 (5.94.0-1),
libkomparediff2-5:amd64 (4:21.12.3-1), khotkeys:amd64 (4:5.24.5-1),
kreversi:amd64 (4:21.08.0-1), kjumpingcube:amd64 (4:21.08.0-1),
kmahjongg:amd64 (4:21.12.3-1), kactivitymanagerd:amd64 (5.24.5-1),
kstars:amd64 (5:3.5.9-1), qml-module-org-kde-qqc2desktopstyle:amd64
(5.94.0-1), kmouth:amd64 (4:21.12.3-1), libkf5gravatar5abi2:amd64
(4:21.12.3-2), pim-sieve-editor:amd64 (4:21.12.3-2), dolphin:amd64
(4:22.04.1-1), konqueror:amd64 (4:21.12.3-1), ktorrent:amd64 (21.12.3-1),
knotes:amd64 (4:21.12.3-2), kup-backup:amd64 (0.9.1-1+b1), blinken:amd64
(4:21.08.0-1), kwin-x11:amd64 (4:5.24.5-1), kdepim-runtime:amd64
(4:21.12.3-4), libkscreenlocker5:amd64 (5.24.5-1), akonadi-server:amd64
(4:21.12.3-2), libkf5pimcommon5abi2:amd64 (4:21.12.3-2),
libkasten4controllers0:amd64 (5:0.26.9-1), kspaceduel:amd64 (4:21.08.0-1),
apper:amd64 (1.0.0-3), libktpmodels9abi1:amd64 (21.12.3-1),
plasma-dataengines-addons:amd64 (4:5.24.5-1), keditbookmarks:amd64
(21.12.3-1), plasma-integration:amd64 (5.24.5-1), khelpcenter4:amd64
(4:17.08.3-1), qml-module-org-kde-analitza:amd64 (4:21.12.3-1),
kdepim-themeeditors:amd64 (4:21.12.3-2), libkf5bookmarks5:amd64 (5.94.0-1),
kolourpaint:amd64 (4:21.12.3-1), libkf5webkit5:amd64 (5.94.0-1),
labplot:amd64 (2.9.0-1), akonadiconsole:amd64 (4:21.12.3-2),
plasma-disks:amd64 (5.24.5-1), kdepim-addons:amd64 (21.12.3-2+b1),
kmplot:amd64 (4:21.12.3-1), rocs:amd64 (4:21.12.3-1),
plasma-discover-backend-fwupd:amd64 (5.24.5-1), libktplogger9abi1:amd64
(21.12.3-1), kiten:amd64 (4:21.12.3-1), konquest:amd64 (4:21.08.0-1),
marble:amd64 (4:21.08.3-1), sddm-theme-breeze:amd64 (4:5.24.5-2),
konsole:amd64 (4:22.04.1-1), kamera:amd64 (4:21.12.3-1), kanagram:amd64
(4:21.12.3-1), kde-telepathy-send-file:amd64 (21.12.3-1), okular:amd64
(4:21.12.3-2), milou:amd64 (4:5.24.5-1), kde-telepathy-auth-handler:amd64
(21.12.3-1), kwalletmanager:amd64 (4:22.04.1-1), kbruch:amd64 (4:21.12.3-1),
kruler:amd64 (4:21.12.3-1), k3b-i18n:amd64 (1:22.04.2-dmo1), kleopatra:amd64
(4:21.12.3-2+b1), libkf5mailimporter5:amd64 (4:21.12.3-2),
libcantorlibs28:amd64 (4:21.12.3-1+b1), qml-module-org-kde-kirigami:amd64
(1.1.0-2), bovo:amd64 (4:21.08.0-1), picmi:amd64 (4:21.08.0-1), ktouch:amd64
(4:21.12.3-1), kamoso:amd64 (21.12.3-1), kde-config-sddm:amd64 (4:5.24.5-1),
libcolorcorrect5:amd64 (4:5.24.5-2), libkf5calendarutils5:amd64
(4:21.12.3-2), libkf5texteditor5:amd64 (5.94.0-2),
libkf5pimtextedit-plugins:amd64 (21.12.3-2), palapeli:amd64 (4:21.08.0-1),
kaccounts-integration:amd64 (4:21.12.3-1), libkf5pimcommonakonadi5abi1:amd64
(4:21.12.3-2), libkf5incidenceeditor5abi1:amd64 (21.12.3-2),
libkf5khtml-bin:amd64 (5.94.0-1), libkf5kdegames7:amd64 (4:21.12.3-1),
libk3b7:amd64 (1:22.04.2-dmo1), kmenuedit:amd64 (4:5.24.5-1),
libkf5khtml5:amd64 (5.94.0-1), plasma-nm:amd64 (4:5.24.5-1), plasma-pa:amd64
(4:5.24.5-1), ktuberling:amd64 (4:21.08.0-1), libkf5contacteditor5:amd64
(4:21.12.3-2), digikam:amd64 (4:7.6.0-1), libkf5akonadimime5:amd64
(4:21.12.3-2), libkf5krossui5:amd64 (5.94.0-1), mbox-importer:amd64
(4:21.12.3-2), liblayershellqtinterface5:amd64 (5.24.5-1), artikulate:amd64
(4:21.12.3-1), khelpcenter:amd64 (4:22.04.1-1),
libkf5akonadisearch-plugins:amd64 (4:21.12.3-2), kmymoney:amd64 (5.1.2-4),
step:amd64 (4:21.12.3-1), kiriki:amd64 (4:21.08.0-1), kde-spectacle:amd64
(22.04.1-1), parley:amd64 (4:21.12.3-1), kshisen:amd64 (4:21.08.0-1),
digikam-private-libs:amd64 (4:7.6.0-1), qml-module-org-kde-kcm:amd64
(5.94.0-1), qml-module-org-kde-runnermodel:amd64 (5.94.0-1), kblackbox:amd64
(4:21.08.0-1), ksquares:amd64 (4:21.08.0-1), accountwizard:amd64
(4:21.12.3-2+b1), libkf5akonadiagentbase5:amd64 (4:21.12.3-2),
okular-extra-backends:amd64 (4:21.12.3-2), plasma-discover:amd64 (5.24.5-1),
kcharselect:amd64 (4:21.12.3-1), libkf5plasma5:amd64 (5.94.0-1),
partitionmanager:amd64 (21.12.3-1), libkf5kontactinterface5:amd64
(21.12.3-2), khangman:amd64 (4:21.12.3-1), libktpwidgets9:amd64 (21.12.3-1),
libkf5templateparser5:amd64 (4:21.12.3-2+b1), libkf5pimtextedit5abi2:amd64
(21.12.3-2), kde-plasma-desktop:amd64 (5:122), libnotificationmanager1:amd64
(4:5.24.5-2), konsole-kpart:amd64 (4:22.04.1-1),
libktpcommoninternals9abi1:amd64 (21.12.3-1), elisa:amd64 (21.08.3-1),
granatier:amd64 (4:21.08.0-1), kcolorchooser:amd64 (4:21.12.3-1),
qml-module-org-kde-newstuff:amd64 (5.94.0-2), kde-telepathy-minimal:amd64
(21.12.3.1), kde-telepathy-kpeople:amd64 (21.12.3-1), kturtle:amd64
(4:21.12.3-1), libktpotr9:amd64 (21.12.3-1),
qml-module-org-kde-games-core:amd64 (4:21.12.3-1), kbreakout:amd64
(4:21.08.0-1), libkf5grantleetheme5:amd64 (21.12.3-3), libkf5contacts5:amd64
(5:5.94.0-1), libkf5messagelist5abi1:amd64 (4:21.12.3-2+b1), kompare:amd64
(4:21.12.3-1), kde-telepathy:amd64 (21.12.3.1), libkf5libkleo5:amd64
(4:21.12.3-2+b1), plasma-framework:amd64 (5.94.0-1), kde-baseapps-bin:amd64
(4:16.08.3-3), task-kde-desktop:amd64 (3.69+rebuild), libreoffice-kf5:amd64
(1:7.3.4~rc2-1), bluedevil:amd64 (4:5.24.5-1),
qml-module-org-kde-ksysguard:amd64 (4:5.24.5-1), kpeople-vcard:amd64
(0.1-2), kmousetool:amd64 (4:21.12.3-1), kollision:amd64 (4:21.08.0-1),
kaffeine:amd64 (2.0.18-1+b1), kaddressbook:amd64 (4:21.12.3-2), kfind:amd64
(4:21.12.3-1), qml-module-org-kde-quickcharts:amd64 (5.94.0-1),
libkf5messageviewer5abi1:amd64 (4:21.12.3-2+b1), plasma-desktop:amd64
(4:5.24.5-1), libkf5akonadicontact5:amd64 (4:21.12.3-2), kde-cli-tools:amd64
(4:5.24.5-1), killbots:amd64 (4:21.08.0-1), libkf5eventviews5abi1:amd64
(4:21.12.3-2), libkf5identitymanagement5:amd64 (21.12.3-2),
libkf5ksieveui5:amd64 (4:21.12.3-2), libkf5mailcommon5abi2:amd64
(4:21.12.3-2+b1), kwin-common:amd64 (4:5.24.5-1), knetwalk:amd64 (4:21.08.0-1)

I use a script to automatically do the following :

apt-get update
apt-get dist-upgrade
apt-get autoremove --purge
deborphan | apt-get remove --purge

Purge: signon-ui-service:amd64 (0.17+16.04.20151125-1),
libstellarsolver2:amd64 (2.3-2), libkf5dav-data:amd64 (1:5.94.0-1),
libkwinglutils13:amd64 (4:5.24.5-1), kde-telepathy-kaccounts:amd64
(21.12.3-1), libmaeparser1:amd64 (1.2.4-1+b1), freerdp2-x11:amd64
(2.7.0+dfsg1-1+b1), libkf5kcmutilscore5:amd64 (5.94.0-2),
libokteta3core0:amd64 (5:0.26.9-1), libxres1:amd64 (2:1.2.1-1),
libkf5syntaxhighlighting-data:amd64 (5.94.0-1), libkf5kirigami2-5:amd64
(5.94.0-1), libkf5ldap5abi1:amd64 (21.12.3-2), libkwineffects13:amd64
(4:5.24.5-1), libksysguardsensorfaces1:amd64 (4:5.24.5-1), libcerf1:amd64
(1.3-2.1), bup:amd64 (0.32-3+b1), signon-ui-x11:amd64
(0.17+16.04.20151125-1), libkdsoap1:amd64 (1.9.1+dfsg-5), par2:amd64
(0.8.1-2), libmatio11:amd64 (1.5.23-2), libsqlcipher0:amd64 (3.4.1-2+b1),
libkf5pimtextedit-data:amd64 (21.12.3-2), libtelepathy-logger-qt5:amd64
(17.09.0-1), python3-tornado:amd64 (6.1.0-3), libqt5networkauth5:amd64
(5.15.4-2), libkf5prisonscanner5:amd64 (5.94.0-2), libkcolorpicker0:amd64
(0.2.0-1), libwcs7:amd64 (7.11+ds-1), qml-module-qtquick-shapes:amd64
(5.15.4+dfsg-3), apt-config-icons-hidpi:amd64 (0.15.4-1),
signon-kwallet-extension:amd64 (4:21.12.3-1), gnuchess-book:amd64
(1.02-2.1), cclib:amd64 (1.6.2-2), libkwaylandserver5:amd64 (5.24.5-1),
libqtav1:amd64 (1.13.0+ds-4), bup-doc:amd64 (0.32-3), libkasten4core0:amd64
(5:0.26.9-1), libsignon-glib2:amd64 (2.1-3), libanalitzagui8:amd64
(4:21.12.3-1), libanalitzaplot8:amd64 (4:21.12.3-1),
qtgstreamer-plugins-qt5:amd64 (1.2.0-5.1), gnuchess:amd64 (6.2.7-1),
libksysguardsystemstats1:amd64 (4:5.24.5-1), libkf5dav5:amd64 (1:5.94.0-1),
signond:amd64 (8.61-1), libgcab-1.0-0:amd64 (1.4-3), libfwupd2:amd64
(1.7.7-1), libkchart2:amd64 (2.8.0-1), libanalitzawidgets8:amd64
(4:21.12.3-1), signon-plugin-password:amd64 (8.61-1),
libqt5gstreamer-1.0-0:amd64 (1.2.0-5.1), libsmbios-c2:amd64 (2.4.3-1),
libqaccessibilityclient-qt5-0:amd64 (0.4.1-1+b1), libkpmcore11:amd64
(21.12.3-1), libkf5mailcommon-data:amd64 (4:21.12.3-2),
libkf5alarmcalendar-data:amd64 (4:21.12.3-2), libqt5quickshapes5:amd64
(5.15.4+dfsg-3), libqtavwidgets1:amd64 (1.13.0+ds-4),
qml-module-org-kde-charts:amd64 (4:21.12.3-1), libkf5calendarcore5abi2:amd64
(5:5.94.0-1), ksystemstats:amd64 (5.24.5-1), python3-pylibacl:amd64
(0.6.0-2), fwupd-amd64-signed:amd64 (1:1.2+3), libavogadro-data:amd64
(1.96.0-2), libsvtav1enc0:amd64 (0.9.1+dfsg-1), libkf5ldap-data:amd64
(21.12.3-2), libmlt-7-7:amd64 (1:7.6.0-dmo2),
qml-module-org-kde-kitemmodels:amd64 (5.94.0-1), paperkey:amd64 (1.6-1),
python3-fuse:amd64 (2:1.0.5-1), libkf5prison5:amd64 (5.94.0-2),
kimageformat-plugins:amd64 (5.94.0-3), libkf5akonadicalendar-data:amd64
(4:21.12.3-2), drkonqi:amd64 (5.24.5-1), plasma-workspace-data:amd64
(4:5.24.5-2), libqt5quickparticles5:amd64 (5.15.4+dfsg-3), libgav1-0:amd64
(0.17.0-1+b1), libmarkdown2:amd64 (2.2.7-2), libkasten4okteta2core0:amd64
(5:0.26.9-1), libqt5gstreamerquick-1.0-0:amd64 (1.2.0-5.1),
libkpimgapicalendar5:amd64 (21.12.3-2), libprocessui9:amd64 (4:5.24.5-1),
ktuberling-data:amd64 (4:21.08.0-1), libaudiofile1:amd64 (0.3.6-5),
libkf5libkleo-data:amd64 (4:21.12.3-2), libkompareinterface5:amd64
(4:21.12.3-1), ktorrent-data:amd64 (21.12.3-1),
libkf5syntaxhighlighting5:amd64 (5.94.0-1),
libtelepathy-qt5-farstream0:amd64 (0.9.8+ds-4), libboost-python1.74.0:amd64
(1.74.0-16), libkimageannotator-common:amd64 (0.6.0-1), ibus-data:amd64
(1.5.26-4), libmlt7-data:amd64 (1:7.6.0-dmo2), libchm1:amd64 (2:0.40a-7),
libfarstream-0.2-5:amd64 (0.2.9-1), libvncclient1:amd64 (0.9.13+dfsg-4),
libkimageannotator0:amd64 (0.6.0-1), libkf5texteditor-bin:amd64 (5.94.0-2),
qml-module-qtwebengine:amd64 (5.15.10+dfsg-1), libokteta3gui0:amd64
(5:0.26.9-1), libkf5jsapi5:amd64 (5.94.0-1), fonts-hack:amd64 (3.003-3),
libreoffice-plasma:amd64 (1:7.3.4~rc2-1), libqalculate22:amd64 (4.2.0-1),
fonts-kanjistrokeorders:amd64 (4.003~dfsg-1), libprocesscore9:amd64
(4:5.24.5-1), libphonenumber8:amd64 (8.12.48+ds-1), stockfish:amd64
(14.1-1), libmlt++-7-7:amd64 (1:7.6.0-dmo2),
qml-module-org-kde-kholidays:amd64 (1:5.94.0-1), libkf5pulseaudioqt3:amd64
(1.3-2), libfreerdp2-2:amd64 (2.7.0+dfsg1-1+b1), libfreecell-solver0:amd64
(5.0.0-2+b1), qml-module-org-kde-people:amd64 (5.94.0-1),
qml-module-org-kde-userfeedback:amd64 (1.2.0-2), libkwinxrenderutils13:amd64
(4:5.24.5-1), libkgantt2:amd64 (2.8.0-1), libreadstat1:amd64 (1.1.8-1),
qml-module-gsettings1.0:amd64 (0.2-4), libkpimitinerary-data:amd64
(21.12.3-3), libkuserfeedbackwidgets1:amd64 (1.2.0-2), libyuv0:amd64
(0.0~git20220427.de71c67-1), bolt:amd64 (0.9.2-1),
akonadi-contacts-data:amd64 (4:21.12.3-2), kuserfeedback-doc:amd64
(1.2.0-2), libeditorconfig0:amd64 (0.12.5-2), libktorrent-l10n:amd64
(21.08.0-2), libavogadro2-1:amd64 (1.96.0-2), libkuserfeedbackcore1:amd64
(1.2.0-2), libwinpr2-2:amd64 (2.7.0+dfsg1-1+b1),
telepathy-accounts-signon:amd64 (2.1-1), qml-module-org-kde-kaccounts:amd64
(4:21.12.3-1), libdmtx0b:amd64 (0.7.5-3+b1), libkf5torrent6abi2:amd64
(21.08.0-2), libftdi1-2:amd64 (1.5-5+b2), libkpimpkpass5:amd64 (21.12.3-2),
libgsettings-qt1:amd64 (0.2-4), smartmontools:amd64 (7.3-1),
libanalitza8:amd64 (4:21.12.3-1), libkf5gravatar-data:amd64 (4:21.12.3-2),
libofx7:amd64 (1:0.10.3-1), libavif14:amd64 (0.10.1-1+b1),
qml-module-qtgstreamer:amd64 (1.2.0-5.1), libopenbabel7:amd64
(3.1.1+dfsg-6+b2), breeze-gtk-theme:amd64 (5.24.5-1),
gstreamer1.0-nice:amd64 (0.1.18-2), libinchi1:amd64 (1.03+dfsg-4+b1),
libqgpgme15:amd64 (1.17.1-4), qml-module-qt-labs-qmlmodels:amd64
(5.15.4+dfsg-3), libotr5:amd64 (4.1.1-5), libfreerdp-client2-2:amd64
(2.7.0+dfsg1-1+b1), libkf5pimcommon-data:amd64 (4:21.12.3-2),
qml-module-qtqml-statemachine:amd64 (5.15.4+dfsg-3), libkf5mediawiki5:amd64
(5.37.0-2), libksgrd9:amd64 (4:5.24.5-1), libsymspg1:amd64 (1.16.5-1+b1),
libgwengui-qt5-79:amd64 (5.9.0-1+b1), qml-module-org-kde-kconfig:amd64
(5.94.0-1), libsignon-extension1:amd64 (8.61-1),
apt-config-icons-large-hidpi:amd64 (0.15.4-1), libkf5akonadixml5:amd64
(4:21.12.3-2), melt7:amd64 (1:7.6.0-dmo2), libflashrom1:amd64 (1.2-5),
qml-module-org-kde-sonnet:amd64 (5.94.0-1), libjcat1:amd64 (0.1.9-1),
libfwupdplugin5:amd64 (1.7.7-1), libksysguardformatter1:amd64 (4:5.24.5-1),
libokteta-l10n:amd64 (5:0.26.9-1), libqt5glib-2.0-0:amd64 (1.2.0-5.1),
libqalculate-data:amd64 (4.2.0-1), kio-ldap:amd64 (21.12.3-2),
kaddressbook-data:amd64 (4:21.12.3-2), libkf5mimetreeparser5abi1:amd64
(4:21.12.3-2+b1), apt-config-icons-large:amd64 (0.15.4-1), lskat-data:amd64
(4:21.08.0-1), libkpimgapitasks5:amd64 (21.12.3-2), sjeng:amd64 (11.2-8.1),
python3-cclib:amd64 (1.6.2-2), qml-module-org-kde-prison:amd64 (5.94.0-2),
akonadi-mime-data:amd64 (4:21.12.3-2), libksysguardsensors1:amd64
(4:5.24.5-1), libibus-1.0-5:amd64 (1.5.26-4),
libsasl2-modules-kdexoauth2:amd64 (21.12.3-2), libdvbv5-0:amd64 (1.22.1-4),
libkf5incidenceeditor-data:amd64 (21.12.3-2), libreoffice-qt5:amd64
(1:7.3.4~rc2-1), fwupd:amd64 (1.7.7-1), libalkimia5-7:amd64 (7.0.2-2),
libtelepathy-farstream3:amd64 (0.6.2-1.1), labplot-data:amd64 (2.9.0-1),
qml-module-qtquick-particles2:amd64 (5.15.4+dfsg-3),
libqt5scripttools5:amd64 (5.15.4+dfsg-2)

Purge: libkf5kipi-data:amd64 (4:21.12.3-1),
qml-module-org-kde-kquickcontrols:amd64 (5.94.0-1), liblensfun1:amd64
(0.3.3-1), qml-module-org-kde-kcoreaddons:amd64 (5.94.0-1),
libkf5plotting5:amd64 (5.94.0-1), libxcb-composite0:amd64 (1.14-3),
libkf5parts-data:amd64 (5.94.0-1), libkf5akonadinotes5:amd64 (4:21.12.3-2),
libkf5dnssd5:amd64 (5.94.0-1), libkf5contacts-data:amd64 (5:5.94.0-1),
libkf5krosscore5:amd64 (5.94.0-1), libkf5notifyconfig5:amd64 (5.94.0-1),
libkf5js5:amd64 (5.94.0-1), qdbus-qt5:amd64 (5.15.4-2), libscim8v5:amd64
(1.4.18+git20211204-0.1), libkf5kcmutils-data:amd64 (5.94.0-2),
qml-module-org-kde-solid:amd64 (5.94.0-1), libkf5kontactinterface-data:amd64
(21.12.3-2), libkf5eventviews-data:amd64 (4:21.12.3-2),
libkf5kmanagesieve5:amd64 (4:21.12.3-2),
qml-module-org-kde-draganddrop:amd64 (5.94.0-1),
libkf5networkmanagerqt6:amd64 (5.94.0-1), libkf5threadweaver5:amd64
(5.94.0-1), libkf5bookmarks-data:amd64 (5.94.0-1), qml-module-qtwebkit:amd64
(5.212.0~alpha4-19), libkf5peoplewidgets5:amd64 (5.94.0-1),
libkf5calendarsupport-data:amd64 (4:21.12.3-2), libkf5screen-bin:amd64
(4:5.24.5-1), libkf5imap5:amd64 (21.12.3-2), kinit:amd64 (5.94.0-1),
libkolabxml1v5:amd64 (1.2.1-1), analitza-common:amd64 (4:21.12.3-1),
frameworkintegration:amd64 (5.94.0-1), libkf5akonadisearchpim5:amd64
(4:21.12.3-2), libkf5xmlgui-data:amd64 (5.94.0-1), ktexteditor-data:amd64
(5.94.0-2), libkeduvocdocument5:amd64 (4:21.12.3-1),
libkf5activitiesstats1:amd64 (5.94.0-1), libxcb-cursor0:amd64 (0.1.1-4),
libpowerdevilui5:amd64 (4:5.24.5-1), libkf5khtml-data:amd64 (5.94.0-1),
libkf5holidays5:amd64 (1:5.94.0-1), libkf5modemmanagerqt6:amd64 (5.94.0-1),
libkf5akonadisearchxapian5:amd64 (4:21.12.3-2),
libkf5akonadisearchdebug5:amd64 (4:21.12.3-2), libkf5sane5:amd64
(21.12.3-1), libkf5mbox5:amd64 (21.12.3-2), libkf5waylandserver5:amd64
(4:5.94.0-2), libosp5:amd64 (1.5.2-13+b2), qml-module-org-kde-kio:amd64
(5.94.0-1), libkf5ksieve5:amd64 (4:21.12.3-2),
libkf5kdelibs4support-data:amd64 (5.94.0-1), libxcb-dpms0:amd64 (1.14-3),
libkf5auth5:amd64 (5.94.0-1), kf5-messagelib-data:amd64 (4:21.12.3-2),
libkf5xmlgui-bin:amd64 (5.94.0-1), libkfontinstui5:amd64 (4:5.24.5-2),
libkf5calendarevents5:amd64 (5.94.0-1), libflac++6v5:amd64 (1.3.4-2),
libkf5sysguard-data:amd64 (4:5.24.5-1), libkf5grantleetheme-plugins:amd64
(21.12.3-3), libfakekey0:amd64 (0.3+git20170516-2),
libkf5kmahjongglib5:amd64 (4:21.12.3-1), libopenconnect5:amd64 (9.01-1),
libkf5unitconversion5:amd64 (5.94.0-1), libkf5newstuff-data:amd64
(5.94.0-2), libspectre1:amd64 (0.2.10-1)libxapian30:amd64 (1.4.18-4),
libpskc0:amd64 (2.6.7-3), libkf5akonadisearchcore5:amd64 (4:21.12.3-2),
libkf5notifyconfig-data:amd64 (5.94.0-1), libpackagekitqt5-1:amd64
(1.0.2-1), libstoken1:amd64 (0.92-1), libkf5imap-data:amd64 (21.12.3-2),
libappstreamqt2:amd64 (0.15.4-1), libkf5akonadicore5abi2:amd64
(4:21.12.3-2), libkf5sane-data:amd64 (21.12.3-1), libqt5script5:amd64
(5.15.4+dfsg-2), libkf5screen7:amd64 (4:5.24.5-1), libkf5people5:amd64
(5.94.0-1), libgrantlee-templates5:amd64 (5.2.0-3),
libkf5unitconversion-data:amd64 (5.94.0-1), liblensfun-data-v1:amd64
(0.3.3-1), libtss2-tctildr0:amd64 (3.2.0-1+b1), libkf5ksieve-data:amd64
(4:21.12.3-2), libkf5mime5abi1:amd64 (21.12.3-2), libkf5holidays-data:amd64
(1:5.94.0-1), libkf5newstuffcore5:amd64 (5.94.0-2), libkfontinst5:amd64
(4:5.24.5-2), libkf5dnssd-data:amd64 (5.94.0-1),
libkf5akonadisearch-data:amd64 (4:21.12.3-2), libtomcrypt1:amd64 (1.18.2-5),
libkf5attica5:amd64 (5.94.0-1), libkf5akonadiprivate5abi2:amd64
(4:21.12.3-2), libkf5akonadi-data:amd64 (4:21.12.3-2),
libkf5peoplebackend5:amd64 (5.94.0-1), libkf5mime-data:amd64 (21.12.3-2),
libkf5syndication5abi1:amd64 (1:5.94.0-1), libxmlsec1-openssl:amd64
(1.2.34-2), libkf5people-data:amd64 (5.94.0-1)

LC_ALL=C sudo apt install plasma-desktop
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  layer-shell-qt : Depends: liblayershellqtinterface5 (>= 5.21.90) but it is
not installable
                   Depends: qtwayland-client-abi-5-15-2
  libkf5xmlgui5 : Depends: qtbase-abi-5-15-2
                  Recommends: libkf5xmlgui-bin (= 5.94.0-1) but it is not
going to be installed
  plasma-integration : Depends: qtbase-abi-5-15-2
  plasma-workspace : Depends: kwin-common (>= 4:5.24~) but it is not installable
                     Depends: libkscreenlocker5 (>= 5.24.2~) but it is not
installable
                     Depends: liblayershellqtinterface5 (>= 5.24.2~) but it
is not installable
                     Depends: qtbase-abi-5-15-2
                     Depends: qtwayland-client-abi-5-15-2
  qml-module-org-kde-kirigami2 : Depends: qtbase-abi-5-15-2
E: Unable to correct problems, you have held broken packages.

Hi,

this is not a bug though. We are in the middle of a Qt transition and Qt
packages are already available in testing-proposed-updates, but the
Plasma packages are not. You are installed Qt 5.15.4 from testing-
proposed-updates, but Plasma in testing needs Qt 5.15.2. That's why so
many packages have been removed.

If you stick to testing or use apt-pinning, you should be able to
reinstall Plasma. The issue will sort itself out in a couple of days
otherwise.

    Hi !

    Indeed I'm using testing-proposed-updates... Do you mean I shouldn't
    use proposed-updates and stick with defaults repositories ?

    It all went well. Thanks a lot.


Thomas.