Debian10->11にアップグレードした後、KDEプラズマを起動できません（黒い画面）。

Debian 10 から 11 にアップグレードしました。アップグレードを完了し、十分なディスク容量（十分な空き容量が必要）、いくつかのrkhunter設定、およびkonsoleコマンドをブロックする無人アップグレードが原因で問題が発生した後に再起動しました。

最初の奇妙なことは、grubパスワードを要求する初期起動画面が赤であることです。青ではなく少し奇妙に見えますが、すぐに再び青に変わります。 2番目の問題は、ログイン後に黒い画面のみが表示されることです（上部にいくつかのウィンドウがあります）。これはPlasshellが実行されていないためです（実行中の唯一のものですstartplasma-x11）。だからkstart5 plasmashell。ただし、完全に読み込まれた直後（デスクトップとタスクバーの表示）がクラッシュするようです。この問題を解決するには？全体の出力は次のとおりです。

Omitting both --window and --windowclass arguments is not recommended

kf.coreaddons: Expected JSON property "X-Plasma-ContainmentCategories" to be a string list. Treating it as a list with a single entry: "panel" org.kde.plasma.desktop.defaultPanel
kf.coreaddons: Expected JSON property "X-Plasma-ContainmentCategories" to be a string list. Treating it as a list with a single entry: "panel" org.kde.plasma.desktop.appmenubar
kf.coreaddons: Expected JSON property "X-Plasma-ContainmentCategories" to be a string list. Treating it as a list with a single entry: "panel" org.kde.plasma.desktop.emptyPanel
kf.plasma.quick: Applet preload policy set to 1
Cyclic dependency detected between "file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml" and "file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
qt.svg: <input>:406:376: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:407:130: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:408:130: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:408:393: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:409:130: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:410:129: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:411:129: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:412:129: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:413:129: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:413:379: Could not add child element to parent element because the types are incorrect.
qt.svg: <input>:413:631: Could not add child element to parent element because the types are incorrect.
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
libpng warning: iCCP: known incorrect sRGB profile
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/homeworld-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/futureprototype-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/futureprototype-theme/wallpaper-withlogo" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/joy-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/joy-inksplat-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/joy-theme/lockscreen" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/lines-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/lines-theme/lockscreen" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/moonlight-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/moonlight-theme/lockscreen" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/wallpapers/Next" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/softwaves-theme/wallpaper" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/softwaves-theme/lockscreen" is a directory. Use addDir!
kf.coreaddons: KDirWatch: "/usr/share/desktop-base/spacefun-theme/wallpaper" is a directory. Use addDir!
libpng warning: iCCP: known incorrect sRGB profile
Plasma Shell startup completed
qml: disabling redshift
qml: renderModeString: 
qml: disabling redshift
qml: onLoaded
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/main.qml:30:1: QML DropArea (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "minimumWidth"
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
Both point size and pixel size set. Using pixel size.
trying to show an empty dialog
trying to show an empty dialog
trying to show an empty dialog
Cyclic dependency detected between "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/global/Globals.qml" and "file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationHeader.qml"
file:///usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/plasma/extras/PlasmoidHeading.qml:56:5: Unable to assign [undefined] to int
Plasma Shell startup completed
Plasma Shell startup completed
trying to show an empty dialog
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Desktop.qml:146:19: QML Loader: Binding loop detected for property "height"
KAStatsFavoritesModel::setFavorites is ignored
Entry is not valid "applications:seahorse.desktop" QSharedPointer(0x563b9bdb07d0)
Entry is not valid "applications:seahorse.desktop" QSharedPointer(0x563b9bd267e0)
file:///usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/FullRepresentation.qml:356: ReferenceError: headerSeparator is not defined
trying to show an empty dialog
qml: clearing connected sources, stop source was: killall redshift; redshift -x
qml: enabling redshift with command: redshift [...]
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: known incorrect sRGB profile
libpng warning: profile matches sRGB but writing iCCP instead
file:///home/username/.local/share/plasma/plasmoids/org.kde.plasma.eventcalendar/contents/ui/TimerView.qml:31:13: QML ToolButton: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///home/username/.local/share/plasma/plasmoids/org.kde.plasma.eventcalendar/contents/ui/TimerView.qml:87:13: QML ColumnLayout: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.