前面我們在安裝Ubuntu18.04系統時就遇到一個配置軟件源的選項，系統默認軟件源來自Ubuntu官方。但是官方軟件源在國內使用並不理想，不僅網速非常慢而且容易出現超時的現象。所以一般我們都會選擇更換國內鏡像源來安裝軟件（比如阿里、網易、清華、中科大等都提供了不錯的鏡像源），我們只要選擇一個適合自己地區的鏡像源進行更換就可以大幅度的提升軟件下載速度了。
備份Ubuntu官方源文件
養成好習慣在更改配置之前最好先做個備份，萬一出現問題還可以恢復哦！然後再窗口中執行以下命名：
<code>cd /etc/apt // 進入到apt目錄
sudo cp sources.list sources.list.back // 複製sources.list文件/<code>
修改sources.list文件
使用超級權限來修改sources.list文件，執行命令：sudo vim /etc/apt/sources.list打開sources.list文件。vim是vi增強版的編輯工具，是一個功能豐富，使用快捷，應用廣泛的開源免費軟件。大多數linux系統上都自帶vim編輯器，可以對文本文件進行建立，顯示，編輯，刪除，複製等操作。我們通過vim將Ubuntu官方源註釋掉（或者直接刪掉）然後換上國內源即可（這裡我換的清華源），複製清華源文件粘貼到文件中後退出輸入模式並輸入 : wq保存退出文件。
更新軟件源
修改並保存好sources.list文件後我們就可以來試試更新軟件源了，使用 sudo apt-get update 命令即可更新獲取清華軟件源提供的軟件列表。
更新軟件
軟件源更新好了我們就可以嘗試下更新軟件了，執行命令：sudo apt-get upgrade即可更新已安裝軟件。
知識拓展：vim 使用
vim 分為三種模式，分別是命令模式、輸入模式、底線命令模式。當啟動vim時進入命令模式，該模式只有一些最基本的命令。比如你要進入輸入模式可以輸入i、刪除當前行可以輸入dd、切換底線模式可以輸入符號：等。進入輸入模式之後可以才可正常輸入內容，退出則按ESC鍵即可切換回命令模式。進入底線模式時可以對文件進行操作，比如wq為保存並退出文件。
其他軟件源
還有很多不錯的國內源可以使用，這裡為大家收集了些常用的國內源。大家可以根據自己的需求選擇適合自己的軟件源進行更換，更換之後記得更新軟件源！
<code>#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
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed 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
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
#163源
deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
#北京交大
deb http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
/<code>
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