System settings
Update system
sudo apt update
sudo apt upgrade
do-release-upgrade
reboot
hostname
vim /etc/hostname
user
adduser ubuntu
usermod -aG sudo ubuntu
ssh config
ssh-copy-id -p 50000 ubuntu@12.98.23.12
# vim /etc/ssh/sshd_config
PermitRootLogin no
PasswordAuthentication no
PubkeyAuthentication yes
service ssh restart
ssh -p 50000 root@12.98.23.12