linux服务更换源

echo "deb http://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free">/etc/apt/sources.list
echo "deb http://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free">>/etc/apt/sources.list
echo "deb http://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free">>/etc/apt/sources.list
echo "deb http://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free">>/etc/apt/sources.list

sudo apt update更新源