1.安装KDE桌面命令
sudo apt-get install kubuntu-desktop

注销
Ctrl+Alt+Backspace

2.设置中文环境
sudo apt-get install language-pack-kde-zh language-pack-kde-zh-base language-pack-zh language-pack-zh-base language-support-zh

3.切换到kdm和gdm的方法是：
sudo dpkg-reconfigure gdm
sudo dpkg-reconfigure kdm