modify source
cd /etc/apt sudo cp sources.list sources.list.bak deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
Permission denied, please try again.
修ssh改配置文件，设置为允许root远程登录：
root@ubuntu:~# vim /etc/ssh/sshd_config
将PermitRootLogin prohibie-password 修改为：PermitRootLogin yes 即可。
sudo groupadd -g 888 rnd sudo useradd -g rnd user01 sudo passwd user01 sudo cp -a /etc/skel /home/user01 sudo chown -R user01:rnd /home/user01 su - user01
ssh user01@192.168.3.65