Steps to Create a New Sudo User
Log in to your server as the root user.

ssh root@server_ip_address

Use the adduser command to add a new user to your system.

Be sure to replace username with the user that you want to create.

adduser username

Set and confirm the new user’s password at the prompt. A strong password is highly recommended!

Set password prompts:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

Follow the prompts to set the new user’s information. It is fine to accept the defaults to leave all of this information blank.

User information prompts:
Changing the user information for username

Enter the new value, or press ENTER for the default
Full Name []:
Room Number []:
Work Phone []:
Home Phone []:
Other []:
Is the information correct? [Y/n]

Use the usermod command to add the user to the sudo group.

usermod -aG sudo username

By default, on Ubuntu, members of the sudo group have sudo privileges.

Test sudo access on new user account

Use the su command to switch to the new user account.

su – username

As the new user, verify that you can use sudo by prepending “sudo” to the command that you want to run with superuser privileges.

sudo command_to_run

For example, you can list the contents of the /root directory, which is normally only accessible to the root user.

sudo ls -la /root

The first time you use sudo in a session, you will be prompted for the password of the user account. Enter the password to proceed.

Output:

[sudo] password for username:

If your user is in the proper group and you entered the password correctly, the command that you issued with sudo should run with root privileges.