1. From the desktop, press Alt+F2 to launch the Run Application window.
  2. Type:gnome-terminalthen press Enter. This will launch a user terminal (similar to Windows command prompt).
  3. At the terminal prompt, type:suthen press Enter. When prompted, type the root (administrator) password then press: Enter. You now have a root terminal session.
  4. At the root terminal, type:usermod -l new old where new is the new username and old is the old / existing username then press: Enter. The username is now changed.

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