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### 18.6 Lockdown when booting on a secure setup

The GRUB can be locked down when booted on a secure boot environment, for example if the UEFI secure boot is enabled. On a locked down configuration, the GRUB will be restricted and some operations/commands cannot be executed.

The ‘`lockdown`’ variable is set to ‘`y`’ when the GRUB is locked down. Otherwise it does not exit.