Ubuntu16.04更新源

注意：不同版本（16.04,18.04,20.04）的源是不一样的

更新源步骤

首先安装vim
Ctrl+Alt+T，打开terminal终端
输入如下命令

sudo apt-get install vim

进入源所在文件夹，查看是否有源文件，即sources.list

cd /etc/apt
ls

如下图所示

做源文件的备份sources.list.bak，使用ls查看是否创建成功

sudo cp sources.list sources.list.bak

如下图所示

编辑源文件sources.list

sudo vim sources.list

如下图所示

使用字母D删除光标所在行，一直按，知道删完内容（出现缓冲区无内容）为止，如下图
然后按键盘的insert键开始编辑文本内容（注意，建议按完之后随便输入几个字母数字，检测是否变为插入模式），将收集的源文件内容粘贴进去，然后按Esc键退出编辑，再以英文键盘输入:wq!即可
输入命令cat sources.list 查看sources.list文件
使用命令行sudo apt-get update更新源（该命令完成后，无报错说明源文件更新完毕）

sudo apt-get update

以网易源举例如下
16.04的网易源

deb http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse

下面两种源未进行核对，不建议使用，否则安装软件时会报各种各样的错误
如unstable，，软件包级别大于……且……正在被安装

deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse

deb http://mirrors.163.com/ubuntu/ wily main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ wily-backports main restricted universe multiverse

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