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
Windows Secure Boot Key Creation and Management Guidance | Microsoft Learn
After Windows Update (automatic) Red Message "Invalid Signature detected. Check Policy in Setup" - Dell Community
Secure Boot Violation- Invalid Signature detected. Check Secure Boot - Microsoft Community
C220 M5 SecureBoot Support Disable fro installing ESXi 6.5 - Cisco Community