安裝Ubuntu20.04系統(tǒng)后，下載安裝軟件包使用默認(rèn)的國(guó)外源太慢了，因此我們可以把源修改為國(guó)內(nèi)源這個(gè)樣會(huì)快很多。

1、首先以root用戶登錄主機(jī)。

2、進(jìn)入源文件目錄。
root@lanan:~# cd /etc/apt

root@lanan:/etc/apt#

3、保險(xiǎn)起見先備份一下原來(lái)的源文件，避免更換出問(wèn)題可以還原回去哈哈哈。
root@lanan:/etc/apt# cp sources.list sources.list.bak

4、修改源。
root@lanan:/etc/apt# vi sources.list
國(guó)外源：

然后把國(guó)外源刪除或用#注釋后更換成我們想要的國(guó)內(nèi)源，這里我修改為阿里源。
阿里源：

5、最后更新下源和軟件。（第一次更新有點(diǎn)慢耐心等待！更新完我們下載安裝軟件包就會(huì)快很多了）

root@lanan:/etc/apt# apt update
root@lanan:/etc/apt# apt upgrade
6、附：常用源。
阿里源：
deb http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

中科大源：
deb http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

清華源：
deb http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

163源：
deb http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

deb http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-security main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-updates main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-proposed main restricted universe multiverse

deb-src http://www.tjdsmy.cn/ubuntu/ bionic-backports main restricted universe multiverse