So what is Secure Boot, and why would it say "Image failed to verify with *ACCESS DENIED*." after an Ubuntu kernel update?
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@davidbaron Secure boot checks that the bootloader was signed by a recognized authority in the UEFI.
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@davidbaron This is to prevent Rootkits to install and run before the OS so that antivirus cannot detect them.
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Replying to @FremyCompany
@FremyCompany That still doesn't answer whether my system is compromised, or whether the latest Ubuntu kernel update broke something...

Dec 20, 2015 · 4:58 AM UTC

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@FremyCompany At least askubuntu.com/questions/7101… says I'm not the only person to see this in the last few days