Secure Boot Violation” may display when Secure Boot is enabled in BIOS and attempting to boot into Ubuntu and Debian - ThinkStation - Lenovo Support CH
Invalid signature detected" message prompt on every boot up. How do I fix? - CPUs, Motherboards, and Memory - Linus Tech Tips
Secure Boot Violation- Invalid Signature detected. Check Secure Boot - Microsoft Community
How to fix Invalid Signature Detected?
ASUS Error: Invalid Signature Detected. Check Secure Boot Policy in Setup – TechCrises.com