安装完Ubuntu Server 后，执行下面脚本安装xfce4和登录界面:

sudo apt-get install xorg lightdm xfce4

配置登录session为xfce4

sudo vim /etc/lightdm/lightdm.conf

然后把下面的配置加入到文件

[SeatDefaults]
allow-guest=false
user-session=xfce

修改默认终端

update-alternatives --install "$(which x-terminal-emulator)" x-terminal-emulator "$(which mate-terminal)" 30
update-alternatives --set x-terminal-emulator "$(which mate-terminal)"