一、为什么要重新配置国内镜像源
配置apt国内镜像源可以加快软件包的下载速度，提高软件安装的效率。如果使用默认的官方源，由于网络原因，下载速度可能会很慢，甚至无法下载。而使用国内的镜像源，可以避免这些问题，提高软件下载的速度和成功率。
二、配置步骤
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首先，先备份旧的源（在修改文件前先备份文件是一个好的习惯）
liujie@liujie-virtual-machine-18:~$ sudo su [sudo] liujie 的密码： root@liujie-virtual-machine-18:/home/liujie# sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak root@liujie-virtual-machine-18:/home/liujie# ls -l /etc/apt/sources.list* -rw-rw-r-- 1 root root 2886 8月 7 14:18 /etc/apt/sources.list -rw-r--r-- 1 root root 2886 11月 9 23:48 /etc/apt/sources.list.bak -rw-rw-r-- 1 root root 2906 8月 7 14:18 /etc/apt/sources.list.save -
设置新的镜像源
root@liujie-virtual-machine-18:/home/liujie# vim /etc/apt/sources.list -
将默认的源删除掉，添加国内的镜像源，例如：清华源、阿里源、中科大源等
在vim中删除文件中所有内容的指令是
:1,$d
其中，:表示进入命令模式，1,$表示从第一行到最后一行，d表示删除。执行该指令后，文件中所有内容都会被删除。清华源：
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse阿里源：
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse中科大源：
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse没有必要全部添加，选择一个即可文章来源：https://www.toymoban.com/news/detail-771845.html
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更新软件包列表并升级已安装的软件包文章来源地址https://www.toymoban.com/news/detail-771845.html
root@liujie-virtual-machine-18:/home/liujie# apt-get updateroot@liujie-virtual-machine-18:/home/liujie# apt-get upgrade
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