ubuntu16.4 更换更新源，ubuntu16.4更换更新

ubuntu16.4 更换更新源，ubuntu16.4更换更新

贴上内容来源https://www.cnblogs.com/Alier/p/6358447.html

1  备份原来的更新源

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

如果提示权限不够就输入下面两行，先进入到超级用户，再备份
sudo -s
cp /etc/apt/sources.list /etc/apt/sources.list.backup

2  修改更新源

　　打开sources.list (这就是存放更新源的文件)

sudo vim /etc/apt/sources.list

　　将下面所有内容复制，粘贴并覆盖sources.list文件中的所有内容

# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security multiverse

3  让更新源生效

sudo apt-get update