Secure Boot Violation” may display when Secure Boot is enabled in BIOS and attempting to boot into Ubuntu and Debian - ThinkStation - Lenovo Support CH
How do I boot from my live USB when I get a secure boot error? - Ask Ubuntu
Secure Boot Violation- Invalid Signature detected. Check Secure Boot - Microsoft Community
SECURE BOOT VIOLATION - Solution (Red screen after Windows update/patch day) [ASUS Mainboard] - YouTube