aid learning如何换源

‘’’
cd /etc/apt/&&
cp sources.list sources.list.bk&&
echo deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free > sources.list&&
echo deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free >> sources.list&&
echo deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free >> sources.list&&
echo deb https://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free >> sources.list&&
echo deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free >> sources.list&&
echo deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free >> sources.list&&
echo deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free >> sources.list&&
echo deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free >> sources.list&&
apt update&&
echo 换源已完成！&&
cd /home
‘’’
复制上面代码，在terminal中，执行一遍，可换为清华源