Create a new user
sudo useradd -m -s /bin/bash -c "Administrative User" admin
Create a password for the admin user using the passwd utility
sudo passwd admin
To enable the user admin to invoke sudo to perform administrative tasks, you need to add the user to the sudo system group using the usermod command as follows, where the -a option means to append user to a supplementary group and -G specifies the group.
sudo usermod -aG sudo admin
Now test sudo access on a new user account by switching to admin’s account (enter admin’s account password when prompted).
su - admin
Make user change password in first login:
sudo passwd -e username
