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I have an issue with installing KDE on my Ubuntu 14.04. I executed

apt-get install kubuntu-desktop

And tried to remove unity

sudo apt-get autoremove --purge unity unity-common unity-services
unity-lens-\* unity-scope-\* unity-webapps-\*
gnome-control-center-unity hud libunity-core-6\* libunity-misc4
libunity-webapps\* appmenu-gtk appmenu-gtk3 appmenu-qt\*
overlay-scrollbar\* activity-log-manager-control-center
firefox-globalmenu thunderbird-globalmenu libufe-xidgetter0
xul-ext-unity xul-ext-webaccounts webaccounts-extension-common
xul-ext-websites-integration gnome-control-center gnome-session

Next I chose KDM as default desktop manager. But now every time I logging in on KDM login screen all I see is empty default KDE wallpaper.

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Press Ctrl+Alt+F1, login and try a sudo apt-get install --reinstall kubuntu-desktop Maybe you uninstalled something needed by KDE desktop. – Cornelius Apr 21 '14 at 16:55
I reinstalled it 2 times:) – Suic Apr 21 '14 at 17:08
up vote 0 down vote accepted

I installed some of removed tools, then switched to lightdm. Then I chosed KDE in login options. And switched back to KDM. It helps. But I think some of this steps was unnecessary

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