dist-upgrade想要删除kubuntu_desktop
多年来我一直在我的电脑上用kde（kubuntu_desktop）运行ubuntu（18.04）。 截至最近（在升级到仿生之后的某个时刻），每当我尝试发布apt-get update / apt-get dist-upgrade时，它会删除kubuntu_desktop以及许多其他软件包，大多数与kde相关。 我将在底部发布输出。
我的问题是：i）如何决定，什么将被删除？ 我的印象是，这应该主要影响已作为其他包的需求而安装的包，并且由于已删除了需求包而变得过时。 当然还有旧内核。 就我而言，我已经明确安装了kubuntu_desktop。 ii）如何防止kubuntu_desktop被删除？
我运行过程一次，看到kde /等离子桌面消失了，手动重新安装（apt-get install kubuntu-desktop），但这并没有改变任何东西。 在下一个dist-upgrade中，kubuntu_desktop仍然在要删除的包列表中。
这是完整的输出：
Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: cryfs fonts-hack fonts-hack-ttf libaribb24-0 libbasicusageenvironment1 libcolorcorrect5 libcrypto++6 libdvbpsi10 libebml4v5 libgps23 libgroupsock8 libkate1 libkwinglutils11 libkwinxrenderutils11 liblivemedia62 libmatroska6v5 libmicrodns0 libopenmpt-modplug1 libplacebo4 libqalculate6 libqalculate6-data libresid-builder0c2a libsdl-image1.2 libsidplay2 libtaskmanager6 libusageenvironment3 libva-wayland2 libvulkan1 libxcb-xv0 plasma-integration pulseaudio-module-gconf qml-module-org-kde-kconfig qml-module-org-kde-kholidays qml-module-org-kde-qqc2desktopstyle qml-module-qtwebengine vlc-bin vlc-data vlc-l10n vlc-plugin-base vlc-plugin-notify vlc-plugin-qt vlc-plugin-samba vlc-plugin-skins2 vlc-plugin-video-splitter vlc-plugin-visualization Use 'sudo apt autoremove' to remove them. The following packages will be REMOVED: bluedevil kate kde-config-screenlocker kinfocenter kscreen kubuntu-desktop kwin kwin-addons kwin-common kwin-x11 libkf5waylandserver5 libkscreenlocker5 libkwin4-effect-builtins1 libkwineffects11 milou plasma-dataengines-addons plasma-desktop plasma-framework plasma-nm plasma-pa plasma-vault plasma-wallpapers-addons plasma-widgets-addons plasma-workspace print-manager sddm-theme-breeze vlc vlc-plugin-video-output The following packages have been kept back: libegl1-mesa libgbm1 libwayland-egl1-mesa 0 upgraded, 0 newly installed, 28 to remove and 3 not upgraded. After this operation, 95.4 MB disk space will be freed. Do you want to continue? [Y/n] n 根据要求，这是我的输出“sudo apt-cache policy apt”
apt: Installed: 1.6.3ubuntu0.1 Candidate: 1.6.3ubuntu0.1 Version table: *** 1.6.3ubuntu0.1 500 500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 100 /var/lib/dpkg/status 1.6.1 500 500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
而且“ls / usr / share / xsessions”的输出是
plasma.desktop