我通过安装将 Lubuntu 转换为 Kubuntu kubuntu-desktop。do-release-upgrade使用以下命令删除 Lubuntu 的残留文件后：
sudo apt-get purge --auto-remove abiword abiword-common abiword-plugin-grammar abiword-plugin-mathview ace-of-penguins audacious audacious-plugins audacious-plugins-data blueman chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg elementary-icon-theme esound-common galculator gdebi gdebi-core gecko-mediaplayer giblib1 gnome-icon-theme-full gnome-mplayer gnome-system-tools gnome-time-admin gnumeric gnumeric-common gnumeric-doc gpicview gtk2-engines-pixbuf guvcview hardinfo leafpad libaacs0 libabiword-2.9 libaudclient2 libaudcore1 libaudiofile1 libbinio1ldbl libbluray1 libbs2b0 libcddb2 libcompfaceg1 libcue1 libencode-locale-perl libept1.4.12 libesd0 libexo-1-0 libexo-common libexo-helpers libfile-listing-perl libfluidsynth1 libfm-data libfm-gtk-data libfont-afm-perl libgdome2-0 libgdome2-cpp-smart0c2a libglade2-0 libgoffice-0.8-8 libgoffice-0.8-8-common libgringotts2 libgsf-1-114 libgsf-1-common libgtkmathview0c2a libguess1 libhtml-form-perl libhtml-format-perl libhtml-parser-perl libhtml-tagset-perl libhtml-tree-perl libhttp-cookies-perl libhttp-daemon-perl libhttp-date-perl libhttp-message-perl libhttp-negotiate-perl libid3tag0 libimlib2 libio-socket-inet6-perl libio-socket-ssl-perl libjpeg-progs libjpeg-turbo-progs liblink-grammar4 libloudmouth1-0 liblwp-mediatypes-perl liblwp-protocol-https-perl libmailtools-perl libmcrypt4 libmowgli2 libmpg123-0 libnet-dbus-perl libnet-http-perl libnet-ssleay-perl libobrender27 libobt0 libonig2 liboobs-1-5 libopts25 libots0 libpisock9 libresid-builder0c2a libsidplay2 libsocket6-perl libtar0 libtidy-0.99-0 libtie-ixhash-perl libtimedate-perl libuniconf4.6 liburi-perl libvdpau1 libwebcam0 libwv-1.2-4 libwvstreams4.6-base libwvstreams4.6-extras libwww-perl libwww-robotrules-perl libxfce4ui-1-0 libxfce4util-bin libxfce4util-common libxfconf-0-2 libxml-parser-perl libxml-twig-perl libxml-xpath-perl libxss1 lightdm-gtk-greeter link-grammar-dictionaries-en lm-sensors lubuntu-artwork lubuntu-artwork-12-04 lubuntu-core lubuntu-default-settings lubuntu-desktop lubuntu-icon-theme lubuntu-software-center lxappearance lxappearance-obconf lxinput lxkeymap lxlauncher lxmenu-data lxpanel lxpanel-indicator-applet-plugin lxrandr lxsession lxsession-edit lxshortcut lxtask lxterminal mplayer2 mtpaint ntp obconf openbox openbox-themes osmo pcmanfm pidgin pidgin-data pidgin-libnotify pidgin-microblog plymouth-theme-lubuntu-logo plymouth-theme-lubuntu-text python-pysqlite2 python-xklavier scrot sylpheed sylpheed-doc sylpheed-i18n sylpheed-plugins synaptic system-tools-backends transmission ttf-lyx uvcdynctrl uvcdynctrl-data wvdial xfburn xfce-keyboard-shortcuts xfce4-power-manager xfce4-power-manager-data xfconf xfonts-100dpi xpad xscreensaver xscreensaver-data
我不知道为什么，但这也删除了 KDE 安装的所有软件包。重新安装后一切都正常kubuntu-desktop，但对我来说似乎仍然很奇怪。
为什么会发生这种情况？