To add and delete a user in Ubuntu, you can follow these steps:

To add a user:

 

1. First, open the Terminal in your Ubuntu. To do this, you can open the "Terminal" from your desktop.

 

2. If you want to add a new user, you will need to log in as a superuser. To do this, type the following command:

  sudo adduser username

 

   Replace "username" with the actual name of the user you want to add.

3. You will be prompted to provide a password for the user. Type a secure password and confirm it.

 

4. You can then provide additional information about the user, such as their full name, phone number, email, etc. You can either fill in this information or leave it blank.

 

 

5. Once you have provided all the necessary information, the user will be added to your system.

 

To delete a user:

 

1. Open the Terminal in your Ubuntu.

 

2. To delete a user, you need to be logged in as a superuser. Type the following command to switch to the superuser account:

 sudo su

 

3. Once you have switched to the superuser account, type the following command to delete the user:

userdel -r username

 

   Replace "username" with the actual name of the user you want to delete.

 

4. You will be prompted to confirm the deletion. Type "yes" to confirm.

 

5. The user will be deleted from your system, along with their home directory and all their files.