周一在 Kubuntu 12.04 机器上运行更新后，我在登录屏幕中失去了选择 KDE 的选项（有一条消息，内容大致为“选项 kde* 已被删除”）。只剩下“默认”和“故障安全”。使用“默认”会导致黑屏，只能看到 KDE 风格的鼠标光标，使用“故障安全”则让我回到登录屏幕。
与此同时，我安装了 Unity（以及gdm它）。然后我尝试
sudo dpkg --reconfigure kdm
但这只会恢复 KDE 登录屏幕（带有额外的 GNOME/Unity 会话选项）。看起来要么是某些 KDE 软件包被卸载了，要么是某些配置已损坏。关于前者：
$ dpkg --get-selections | grep kde
apport-kde install
apturl-kde install
firefox-kde-support install
gdebi-kde install
jockey-kde install
kde-baseapps-bin install
kde-baseapps-data install
kde-config-gtk install
kde-config-touchpad install
kde-runtime install
kde-runtime-data install
kde-style-oxygen install
kde-wallpapers-default install
kde-window-manager install
kde-window-manager-common install
kde-workspace-bin deinstall
kde-workspace-data install
kde-workspace-kgreet-plugins install
kde-zeroconf install
kdebase-bin install
kdebase-runtime install
kdebase-runtime-data deinstall
kdebase-workspace-bin deinstall
kdebase-workspace-data deinstall
kdegames-card-data install
kdegraphics-libs-data install
kdegraphics-mobipocket install
kdegraphics-strigi-analyzer install
kdegraphics-strigi-plugins install
kdegraphics-thumbnailers install
kdelibs-bin install
kdelibs5-data install
kdelibs5-plugins install
kdemultimedia-kio-plugins install
kdenetwork-filesharing install
kdepasswd install
kdepim-groupware deinstall
kdepim-kresources install
kdepim-runtime install
kdepim-strigi-plugins install
kdepimlibs-kio-plugins install
kdesudo install
kdewallpapers install
language-pack-kde-en install
language-pack-kde-en-base install
language-selector-kde install
libakonadi-kde4 install
libdebconf-kde0 install
libkde3support4 install
libkdeclarative5 install
libkdecorations4 install
libkdecore5 install
libkdegames5 deinstall
libkdegames5a install
libkdepim4 install
libkdepimdbusinterfaces4 install
libkdesu5 install
libkdeui5 install
libkdewebkit5 install
libreoffice-kde install
polkit-kde-1 install
python-kde4 install
software-properties-kde install
system-config-printer-kde install
update-manager-kde install
usb-creator-kde install
xsettings-kde install
我认为某些软件包可能丢失了，但我不确定，并且我不想进行实验，因为担心丢失我的 KDE 特定配置和/或使情况变得更糟。
照这个思路来说：如何在不丢失配置的情况下恢复登录时的 KDE 选项？
答案1
也许一些 KDE 包被删除了？
尝试sudo apt-get install kubuntu-desktop。