Ubuntu server 18.04 initial user setup

# Add user
adduser ubuntu

# Set to super user
usermod -aG sudo ubuntu

# Switch user
sudo su ubuntu

# Add .ssh to ubuntu user
mkdir ~/.ssh
cd ~/.ssh
touch authorized_keys

# generate key in LOCAL
ssh-keygen # then input filename

# Copy .pub content to authorized_keys
# in LOCAL
cat ~/.ssh/filename.pub
# Copy content

# on SERVER
nano ~/.ssh/authorized_keys
# paste ~/.ssh/filename.pub content

# Make ubuntu user sudo without password
sudo visudo
# add this text to the last line then save
ubuntu ALL=(ALL) NOPASSWD:ALL