Comando para remover o kubuntu-desktop.
sudo apt-get remove akonadi-server akregator amarok amarok-common
amarok-utils apport-kde apturl-kde ark cdrdao dolphin dragonplayer
exiv2 foomatic-db-gutenprint gdebi-kde gnupg-agent gtk2-engines-qtcurve
gwenview hpijs-ppds ibus-qt4 ijsgutenprint imagemagick install-package
jockey-kde k3b k3b-data kaddressbook kamera kate kcm-gtk
kde-icons-oxygen kde-style-qtcurve kde-window-manager kde-zeroconf
kdebase-bin kdebase-data kdebase-plasma kdebase-runtime
kdebase-runtime-bin-kde4 kdebase-runtime-data
kdebase-runtime-data-common kdebase-workspace-bin
kdebase-workspace-data kdebase-workspace-kgreet-plugins
kdebase-workspace-libs4+5 kdebluetooth kdegraphics-strigi-plugins
kdelibs-bin kdelibs5 kdelibs5-data kdemultimedia-kio-plugins kdepasswd
kdepim-groupware kdepim-kresources kdepim-runtime kdepim-runtime-data
kdepim-runtime-libs4 kdepim-strigi-plugins kdepim-wizards
kdepimlibs-data kdepimlibs5 kdesudo kdm kfind khelpcenter4 kipi-plugins
klipper kmag kmail kmix kmousetool knotes konq-plugins
konq-plugins-l10n konqueror konqueror-nsplugins
konqueror-plugin-searchbar konqueror-plugins konsole kontact kopete
korganizer kpackagekit kppp krdc krfb ksnapshot ksysguard ksysguardd
ksystemlog ktimetracker ktorrent ktorrent-data kubuntu-artwork-usplash
kubuntu-default-settings kubuntu-desktop kubuntu-docs
kubuntu-firefox-installer kubuntu-konqueror-shortcuts kvkbd
kwalletmanager kwin-style-qtcurve language-selector-qt
libakonadiprivate1 libao2 libaudio2 libboost-program-options1.38.0
libclucene0ldbl libepub0 libexiv2-5 libfftw3-3 libflac++6
libindicate-qt0 libjpeg-progs libk3b6 libkabcommon4 libkcddb4
libkdcraw7 libkdecorations4 libkdepim4 libkexiv2-7 libkipi6 libkleo4
libknotificationitem1 libkonq5 libkonq5-templates libkonqsidebarplugin4
libkontactinterfaces4 libkopete4 libkorundum4-ruby1.8 libkpgp4
libksane0 libksieve4 libkwineffects1 liblancelot0 liblastfm0 liblzma0
libmimelib4 libmodplug0c2 libmpcdec3 libmsn0.1 libokularcore1 libotr2
libpackagekit-glib11 libpackagekit-qt11 libplasma3 libpolkit-dbus2
libpolkit-grant2 libpolkit-qt0 libpolkit2 libpoppler-qt4-3 libqca2
libqca2-plugin-ossl libqimageblitz4 libqscintilla2-5 libqt4-assistant
libqt4-dbus libqt4-designer libqt4-help libqt4-network libqt4-opengl
libqt4-phonon libqt4-qt3support libqt4-ruby1.8 libqt4-script
libqt4-scripttools libqt4-sql libqt4-sql-mysql libqt4-sql-sqlite
libqt4-svg libqt4-test libqt4-webkit libqt4-xml libqt4-xmlpatterns
libqtcore4 libqtgui4 libqtscript4-core libqtscript4-gui
libqtscript4-network libqtscript4-sql libqtscript4-uitools
libqtscript4-xml libruby1.8 libscim8c2a libsmokekde4-2 libsmokeqt4-2
libsoprano4 libstreamanalyzer0 libstreams0 libstrigiqtdbusclient0
libtag-extras1 libtidy-0.99-0 libvncserver0 libxcb-shape0 libxcb-shm0
libxcb-xv0 libxine1 libxine1-bin libxine1-console libxine1-misc-plugins
libxine1-x libzip1 mysql-server-core-5.1 okular okular-extra-backends
openoffice.org-kde openoffice.org-style-oxygen oxygen-cursor-theme
packagekit packagekit-backend-apt phonon-backend-xine pinentry-gtk2
pinentry-qt4 plasma-dataengines-addons plasma-dataengines-workspace
plasma-scriptengine-python plasma-widget-facebook
plasma-widget-folderview plasma-widget-googlecalendar
plasma-widget-indicatordisplay plasma-widget-kimpanel
plasma-widget-kubuntu-qa-feedback plasma-widget-lancelot
plasma-widget-networkmanagement plasma-widget-quickaccess
plasma-widgets-addons plasma-widgets-workspace policykit printer-applet
python-kde4 python-packagekit python-qt4 python-qt4-dbus python-sip4
quassel quassel-data ruby ruby1.8 software-properties-kde
soprano-daemon speedcrunch system-config-printer-kde systemsettings
ttf-arphic-uming ttf-dejavu ttf-dejavu-extra update-manager-kde
update-notifier-kde usb-creator-kde userconfig && sudo apt-get
install ubuntu-desktop
Retira tudo e instala o desktop-ubuntu
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