ubuntu18.04 修改apt源

由于默认的apt源下载很慢，所以我们需要修改成国内源：

1.首先备份之前的源：

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

2.然后打开源文件

:

sudo vim /etc/apt/sources.list
           

3.我们这里要修改成阿里的源：

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

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

4.然后更新软件列表：

sudo apt-get update
           

就变成阿里的源了，网速也快了不少！！！

更新软件包

5.更新软件包：

sudo apt-get upgrade