เพิ่ม User บน Ubuntu 18.04

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create home directory for new user

$ mkdir -p /home/<new user>

create user

$ useradd -d /home/<new user> <new user> 

set the user group ownership

$ chown -R <new user>:<new user> /home/<new user>

set default shell for user login

$ usermod --shell /bin/bash ubuntu