新安装的ubuntu系统，需要做下简单的优化，使其符合常用习惯，优化过程的命令与centos大都不一致，撰文备份，以备所需：

1.获取ubuntu系统root权限

　　在终端输入sudo passwd root，按回车，然后系统会提示你输入普通用户的密码(终端输入的密码都是不显示的)。输入后，按回车，然后重复输入两次新的root密码即可激活root用户。

2.安装vim文本编辑器

　　输入命令：sudo apt-get install vim-gtk

3.允许root远程登陆

apt-get install openssh-server

修改/etc/ssh/sshd_config

注释PermitRootLogin prohibit-password

添加PermitRootLogin yes

reload一下sshd服务即可

4.使ubuntu系统可以ssh远程连接

　　需要修改/etc/ssh/ssh_config文件，去掉最后一行PermitRootLogin yes

5.关闭防火墙

　　ufw disable

6.更新apt-get源为阿里源

　　替换/etc/apt/sources.list文件中内容为：

deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties

deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted

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

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted

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

deb http://mirrors.aliyun.com/ubuntu/ xenial universe

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe

deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse

deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse

deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse

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

deb http://archive.canonical.com/ubuntu xenial partner

deb-src http://archive.canonical.com/ubuntu xenial partner

deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted

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

deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe

deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse