Ubuntu: How to delete a user

  In Ubuntu 12.04 and 12.10, to delete an additional user you have created, use the following:  
sudo deluser [username]
  By example, if we wanted to delete a user we created called “test”, we would run:  
sudo deluser test
  Which gives:  
Removing user `test’ … Warning: group `test’ has no more members. Done.
  Be careful with this – don’t delete your admin account 🙂