Ubuntu安裝完畢之后，默認(rèn)的源是Ubuntu自己的，但畢竟Ubuntu服務(wù)器在國(guó)外，我們?cè)L問(wèn)起來(lái)會(huì)比較慢，可以將軟件源切換為國(guó)內(nèi)源，比如：阿里源，清華源，中科大源等等。在這邊以清華源為例，其它源也是一樣的道理。

1 切換源之前先把配置文件備份一份：

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

2 找到清華源官網(wǎng)：

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

一定要選擇與自己版本相對(duì)應(yīng)的源，比如當(dāng)前使用Ubuntu20.04，最好使用此版本的源，否則有可能會(huì)有意料不到的問(wèn)題，良許就吃過(guò)這方面的虧。

網(wǎng)絡(luò)上也有很多教你換源的帖子，但都是直接給出內(nèi)容，有可能源與自己的版本不一致，所以最好自己去官網(wǎng)復(fù)制。

3.將之前的源全部刪除

echo ” > sources.list

4.編輯新源文件

nano sources.list

5.加入新的數(shù)據(jù)源（清華數(shù)據(jù)源）

# 默認(rèn)注釋了源碼鏡像以提高 apt update 速度，如有需要可自行取消注釋 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse# 預(yù)發(fā)布軟件源，不建議啟用 # deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse

6.使用新源替換掉原來(lái)的源（一定要加sudo）：

sudo vi /etc/apt/sources.list

7.然后更新軟件包緩存：

sudo apt update

這個(gè)命令，會(huì)訪問(wèn)源列表里的每個(gè)網(wǎng)址，并讀取軟件列表，然后保存在本地電腦。

8.通常我們會(huì)緊跟著再執(zhí)行命令：

sudo apt-get upgrade

這個(gè)命令，會(huì)把本地已安裝的軟件，與剛下載的軟件列表里對(duì)應(yīng)軟件進(jìn)行對(duì)比，如果發(fā)現(xiàn)已安裝的軟件版本太低，就會(huì)提示你更新。

9.備用數(shù)據(jù)源【阿里】

在下面網(wǎng)站查找最新數(shù)據(jù)源

https://developer.aliyun.com/mirror/ubuntu?spm=a2c6h.13651102.0.0.b5371b11tio0iu

Ubuntu 14.04.5 LTS為例，最后的效果如下：

deb https://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiversedeb https://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiversedeb https://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse## Not recommended # deb https://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse # deb-src https://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse

ubuntu 16.04 配置如下

deb http://mirrors.aliyun.com/ubuntu/ xenial main deb-src http://mirrors.aliyun.com/ubuntu/ xenial maindeb http://mirrors.aliyun.com/ubuntu/ xenial-updates main deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates maindeb http://mirrors.aliyun.com/ubuntu/ xenial universe deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universedeb http://mirrors.aliyun.com/ubuntu/ xenial-security main deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe

ubuntu 18.04(bionic) 配置如下

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

ubuntu 20.04(focal) 配置如下

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

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