不要用清华源
实在是太慢了搞死我了
要用就用中科大源 又快又好用 真不知道CSDN 为啥用清华源说快
直接放链接
https://mirrors.ustc.edu.cn/help/ubuntu.html
还是需要手动配置的 设置里面配有问题
备份 sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo chmod 777 /etc/apt/sources.list 更改文件权限使其可编辑
sudo gedit /etc/apt/sources.list 打开文件进行编辑
删了原来的直接用新的
# 默认注释了源码仓库，如有需要可自行取消注释
deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
# 预发布软件源，不建议启用
# deb https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse