sudo passwd

cd /etc/apt

cp sources.list sources.list.backup

https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/

apt-get update

apt-get remove openssh-server -y

apt-get install openssh-server -y

vim /etc/ssh/sshd_config

Port 2222  # 默认的是22，但是windows有自己的ssh服务用的也是22端口，修改一下
UsePrivilegeSeparation no
PasswordAuthentication yes
AllowUsers root
PermitRootLogin  yes

service ssh --full-restart