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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 vim /etc/apt/sources.list

阿里源

bullseye 换源

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deb https://mirrors.aliyun.com/debian/ bullseye main non-free contrib
#deb-src https://mirrors.aliyun.com/debian/ bullseye main non-free contrib
deb https://mirrors.aliyun.com/debian-security/ bullseye-security main
#deb-src https://mirrors.aliyun.com/debian-security/ bullseye-security main
deb https://mirrors.aliyun.com/debian/ bullseye-updates main non-free contrib
#deb-src https://mirrors.aliyun.com/debian/ bullseye-updates main non-free contrib
deb https://mirrors.aliyun.com/debian/ bullseye-backports main non-free contrib
#deb-src https://mirrors.aliyun.com/debian/ bullseye-backports main non-free contrib

3.更新源

sudo apt-get update

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临时使用

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pip install -i https://pypi.tuna.tsinghua.edu.cn/simple xxxx

永久更改pip源

可以选择升级下pip再配置

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pip install pip -U 
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip config set global.trusted-host pypi.douban.com

查看当前pip源：
pip config list

国内源 地址
阿里云 http://mirrors.aliyun.com/pypi/simple/
中国科技大学 https://pypi.mirrors.ustc.edu.cn/simple/
豆瓣 http://pypi.douban.com/simple
Python官方 https://pypi.python.org/simple/
v2ex http://pypi.v2ex.com/simple/
××× http://pypi.mirrors.opencas.cn/simple/
清华大学 https://pypi.tuna.tsinghua.edu.cn/simple/
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