If a user has not yet been configured, use the grub2-setpassword command to provide a password for the root user: Remove -unrestricted from the main CLASS= statement in the /etc/grub.d/10_linux file. To password protect the GRUB2 bootloader: If there is a dual boot on the system, an attacker can select an operating system like DOS at boot time that ignores access controls and file permissions.
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