change source fastly in ubuntu

使用几行代码快速完成备份及更新软件源

阿里源

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak_`date "+%y_%m_%d"`
sudo sed -i 's/http:\/\/.*.ubuntu.com/https:\/\/mirrors.aliyun.com/g' /etc/apt/sources.list
sudo apt update
sudo apt upgrade

清华源

sudo sed -i 's/http:\/\/.*.ubuntu.com/https:\/\/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list

Reference from: https://www.cnblogs.com/fang-d/p/Ubuntu20_04-Change_repo.html