Use GUI and command-line tools to add, remove, and modify users and groups on the system.
So you have used your Ubuntu desktop for some time, and it has started to attract attention from the other members of your household. They all want in on the action, but you may not necessarily want them to be able to edit your files. The solution is to create new accounts for each person that wants to access your system. That way, everyone will have their own login, password, and home directory to store files. Under Ubuntu, you have a number of options to edit users and groups, both with GUI and command-line tools.
Ubuntu provides a GUI tool that makes user and group management relatively easy. Click System→Administration→Users and Groups to start the user administration tool (Figure 8-1). The interface is split into two tabs, the first for users and the second for groups, and has buttons on the right side to add, edit, and delete users and groups. By default, only the users and groups you most likely want to edit are displayed, but you can toggle the "Show all users and groups" checkbox at the bottom of the window to see everything.
Figure 8-1. Ubuntu user administration tool
To add a new user, click the Add User button. A new window will appear with a number of fields to fill out (Figure 8-2). The Username and Password fields are ...