ubuntu换源笔记

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1.备份源

ctrl+alt+t打开终端

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

2.打开源文件

用gedit打开源文件，ctrl+a全选删除，并粘贴更换源（任选一个）

sudo gedit /etc/apt/sources.list

bfsu源

18.04 LTS(bionic) 换源

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deb https://mirrors.bfsu.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.bfsu.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.bfsu.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.bfsu.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
清华源

20.04 LTS(focal) 换源

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deb 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 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

3.更新源

sudo apt-get update