问一下 在Ubuntu下怎么装图形界面?

按照以下步骤操作：
1、更新/etc/apt/sources.list源
deb http://mirrors.aliyun.com/ubuntu precise main restricted
deb-src http://mirrors.aliyun.com/ubuntu precise main restricted
deb http://mirrors.aliyun.com/ubuntu precise-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu precise-updates main restricted
deb http://mirrors.aliyun.com/ubuntu precise universe
deb-src http://mirrors.aliyun.com/ubuntu precise universe
deb http://mirrors.aliyun.com/ubuntu precise-updates universe
deb-src http://mirrors.aliyun.com/ubuntu precise-updates universe
deb http://mirrors.aliyun.com/ubuntu precise multiverse
deb-src http://mirrors.aliyun.com/ubuntu precise multiverse
deb http://mirrors.aliyun.com/ubuntu precise-updates multiverse
deb-src http://mirrors.aliyun.com/ubuntu precise-updates multiverse
deb http://mirrors.aliyun.com/ubuntu precise-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu precise-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
2、安装ubuntu所需的图形组件
如：sudo apt-get install gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal
3、配置vnc，并启动vcn服务
4、通过vnc连接至ubuntu服务器或pc.