ubuntu16.04 源更新

寻找ubuntu源，实测清华，阿里速度都不错，这里选清华的

参考:https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/

步骤如xia:

1.备份源文件：

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bk

2.添加源：

sudo gedit /etc/apt/sources.list

添加如下内容，保存退出

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

3.update

sudo apt-get update

4.test

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sudo apt-get install sl

sl