更新软件安装源
Debian10安装完成之后，国内用户首先需要修改更新源，这使用阿里的源：
cat > /etc/apt/sources.list <<EOF
deb http://mirrors.aliyun.com/debian/ buster main non-free contrib
deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
deb http://mirrors.aliyun.com/debian-security/ buster/updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian-security/ buster/updates main non-free contrib
EOF
安装ssh
安装ssh：
apt install openssh-server
启用ssh服务：
systemctl start ssh.service
修改配置：
vi /etc/ssh/sshd_config
修改的内容：
PermitRootLogin yes
PasswordAuthentication yes
让普通用户可以切换root登录
修改文件：
vi /etc/sudoers
在root下面增加一个用户：
user01 ALL=(ALL:ALL) ALL