一、為什么要重新配置國內鏡像源

??配置apt國內鏡像源可以加快軟件包的下載速度，提高軟件安裝的效率。如果使用默認的官方源，由于網絡原因，下載速度可能會很慢，甚至無法下載。而使用國內的鏡像源，可以避免這些問題，提高軟件下載的速度和成功率。

二、配置步驟

1. 首先，先備份舊的源（在修改文件前先備份文件是一個好的習慣）

   liujie@liujie-virtual-machine-18:~$ sudo su
   [sudo] liujie 的密碼：
   
   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
   

2. 設置新的鏡像源

   root@liujie-virtual-machine-18:/home/liujie# vim /etc/apt/sources.list
   

3. 將默認的源刪除掉，添加國內的鏡像源，例如：清華源、阿里源、中科大源等

   在vim中刪除文件中所有內容的指令是:1,$d
   其中，:表示進入命令模式， 1,$表示從第一行到最后一行，d表示刪除。執(zhí)行該指令后，文件中所有內容都會被刪除。

   清華源：

   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
   

   沒有必要全部添加，選擇一個即可

4. 更新軟件包列表并升級已安裝的軟件包文章來源地址http://www.zghlxwxcb.cn/news/detail-771845.html

   root@liujie-virtual-machine-18:/home/liujie# apt-get update
   

   root@liujie-virtual-machine-18:/home/liujie# apt-get upgrade
   

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