ubuntu 14.04安装

最近想搞spark。没有集群环境，想先在单机上跑。但是两年前一直用到现在的virtualbox已经太老，很多源都停更了。所以准备装ubuntu14.04。

0. 更新源。163的源有问题，用的是sohu的源；

 deb http://mirrors.sohu.com/ubuntu/ trusty main restricted universe multiverse
 deb http://mirrors.sohu.com/ubuntu/ trusty-security main restricted universe multiverse
 deb http://mirrors.sohu.com/ubuntu/ trusty-updates main restricted universe multiverse
 deb http://mirrors.sohu.com/ubuntu/ trusty-proposed main restricted universe multiverse
 deb http://mirrors.sohu.com/ubuntu/ trusty-backports main restricted universe multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ trusty main restricted universe multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ trusty-security main restricted universe multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ trusty-updates main restricted universe multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ trusty-proposed main restricted universe multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ trusty-backports main restricted universe multiverse

然后执行：

 apt-get update

1. 首先是允许root登录；

 vi /usr/share/lightdm/lightdm.conf.d/-ubuntu.conf

加入这一句：

 greeter-show-manual-login=true

然后再修改一下root密码：

 sudo passwd root

2. 装virtualbox 的extension，不然都不能全屏和复制；

老是提示

The headers for the current running kernel were not found. If the following
module compilation fails then this could be the reason.

解决方案是安装下面的东西：

 apt-get install g++ linux-headers-3.13.--generic build-essential dkms

缺一不可。