The popular privacy-focused Tails OS has released version 4.5 this, for the first time it supports the security feature named UEFI Secure Boot. The secure boot is a security mechanism used to secure the boot process by allowing the loading of drivers signed with an acceptable digital signature. The security feature is part of the UEFI 2.3.1 Errata C specification (or higher), when the Secure Boot is enabled the OS is loaded only after all the firmware checks pass. The Secure Boot prevents that malware such as a rootkit will replace the boot loader staying undetectable on a target system.”]
Source: https://securityaffairs.co/wordpress/101356/security/tails-os-4-5-secure-boot.html