cat > /etc/apt/sources.list<<EOF
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ bullseye-backports main contrib non-free
deb https://security.debian.org/debian-security bullseye-security main contrib non-free
# deb-src https://security.debian.org/debian-security bullseye-security main contrib non-free
# deb http://snapshot.debian.org/archive/debian/20240211T000000Z bullseye main
deb http://deb.debian.org/debian bullseye main
# deb http://snapshot.debian.org/archive/debian-security/20240211T000000Z bullseye-security main
deb http://deb.debian.org/debian-security bullseye-security main
# deb http://snapshot.debian.org/archive/debian/20240211T000000Z bullseye-updates main
deb http://deb.debian.org/debian bullseye-updates main
EOF
apt update
apt install iputils-ping -y
