原因为未安装ca-certificates
可以先编辑 /etc/apt/sources.list 文件临时使用http源
vim /etc/apt/sources.list
粘贴或者更改源（https:// 到 http://)
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
然后安装ca-certificates包（注意：看到有的文章将源改为http便无下文，建议继续执行以下步骤改回https，使用http将大幅度提高网络风险）
apt update
apt install ca-certificates
安装完成后编辑源 /etc/apt/sources.list
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
执行apt update
