Deleting a user may be necessary when the user is no longer needed. It may also be necessary when redistributing resources or changing user access rights.
Let's look at how to delete a user in Ubuntu using the GUI. This is one of the easiest and most accessible ways, which can be used by every system owner.
Open System Preferences:

Next, click on the Users item:

Now all actions are unavailable, and are drawn in gray. To activate them, click the Unlock button and enter the user's password.

Next, to delete a user in linux is enough to click on it with the mouse, and then click at the bottom of the page click on Delete User:

In the window that opens, you can choose what you want to do with the user's files:
Naturally, only the home folder will be deleted, we are not talking about all files. And for correct deletion the user must be unlogged in the system.