ubuntu 14.04 source.list

http://blog.youkuaiyun.com/u010053463/article/details/49300625

ubuntu 14.04 添加阿里镜像源

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

ubuntu设置root密码

1. 切换到root用户 执行
   sudo passwd #设置root密码

   1. 回车，回车，回车就完成了，然后

su root 切换root用户

ubuntu14.04 sudo免密码

1. cd /etc/sudoers.d
2. vi nopasswd4sudo

`your_account` ALL=(ALL) NOPASSWD : ALL 

ubuntu 开机默认进入root用户

vim /etc/lightdm/lightdm.conf

# 里面改成下面内容，就自己root登陆了，别忘了设置root密码在
"autologin-user=root"