debian-更新证书

1. debian buster 已经过期，apt 源官方改为
# 存档源（解决404关键）
deb http://archive.debian.org/debian/ buster main contrib non-free
deb http://archive.debian.org/debian-security/ buster/updates main contrib non-free
deb http://archive.debian.org/debian/ buster-updates main contrib non-free

2. 更新为http镜像

 sed -i 's|https://|http://|g'  /etc/apt/sources.list

3. 更新 ca 并验证状态

apt install --reinstall ca-certificates
update-ca-certificates --fresh
echo | openssl s_client -connect mirrors.zju.edu.cn:443 2>/dev/null | openssl x509 -noout -text

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参考：https://geekdaxue.co/read/baxiang@linux/ne2ilm