To disable automatic login on Linux, complete the following steps:
- Log in to the Admin account.
- Run Start -> System -> Administration -> Login Window.
- After you enter the admin password, the Login Window Preferences dialog appears. On the Security tab, deselect Enable Automatic Login. You can also change the User to admin if you want to always login as admin; however, this is not recommended for security reasons.
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Disabling-Automatic-Login-in-Linux.pdf