备份源
sudo cp /etc/apt/sources.list /etc/apt/sources.list_bak
切换源地址(切换任意一个即可)
切换中国科技大学
sudo sed -i 's/deb.debian.org/mirrors.ustc.edu.cn/g' /etc/apt/sources.list
切换网易云163
sudo sed -i 's/deb.debian.org/mirrors.163.com/g' /etc/apt/sources.list
切换阿里云
sudo sed -i 's/deb.debian.org/mirrors.aliyun.com/g' /etc/apt/sources.list
切换清华同方
sudo sed -i 's/deb.debian.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list
更新索引
sudo apt-get update