如果是刚安装的ubuntu，root不能直接登入需要改密码

1. 改root密码

sudo passwd root 

2. 刚安装的需要更新源列表

apt-get update

apt-get upgrade

3. 安装vim 编辑器

apt-get install vim

更新源

1. 备份源

cp /etc/apt/sources.list ./sources

2. 更新源

 gedit /etc/apt/sources.list ；选择下面其中一个源进行替换（推荐清华源）

apt-get update        ；替换后记得更新源列表

#阿里云

deb http://mirrors.aliyun.com/ubuntu/ groovy main universe restricted multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ groovy main universe restricted multiverse #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ groovy-security main universe restricted multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ groovy-security main universe restricted multiverse #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ groovy-updates main universe restricted multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ groovy-updates main universe restricted multiverse #Added by software-properties

#ubuntu中国官方镜像源
deb http://cn.archive.ubuntu.com/ubuntu/ groovy main universe restricted multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ groovy main universe restricted multiverse #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ groovy-security main universe restricted multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ groovy-security main universe restricted multiverse #Added by software-properties
deb http://cn.archive.ubuntu.com/ubuntu/ groovy-updates main universe restricted multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ groovy-updates main universe restricted multiverse #Added by software-properties

#清华源 ( https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/ )

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy main universe restricted multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy main universe restricted multiverse #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ groovy-security main universe restricted multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy-security main universe restricted multiverse #Added by software-properties
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy-updates main universe restricted multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ groovy-updates main universe restricted multiverse #Added by software-properties

设置中文

1. 选择Settings

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 12. 重新登陆

root图形界面登入

1. 打开终端运行命令

sudo vim /etc/pam.d/gdm-autologin

2. 注释行

auth requied pam_succeed_if.so user != root quiet success

3.  运行命令

sudo vim /etc/pam.d/gdm-password

4. 注释行

auth requied pam_succeed_if.so user != root quiet success

5. 运行命令

sudo vim /root/.profile

6. 在 mesg n 2> /dev/null || true 前面添加 tty -s &&