[PlanetCCRMA] Invalid signature

[Fernando Lopez-Lezcano]

On 04/17/2015 07:15 PM, Len wrote:
> Hi,
>
> I recently installed Fedora 21 on a new system. After installing the
> planetccrma core packages, attempting to boot the realtime kernel gives
> the following:
>
>    error: /vmlinux-3.18.9-201.rt5.1.fc21.ccrma.x86_64+rt has invalid
> signature.
>    error: you need to load the kernel first.
>
>    Press any key to continue...
>
> Has anyone else seen this, or know what causes it?

Hi Len,

You are booting with a UEFI secure boot enabled.

I found this online that explains things a bit:
http://docs.fedoraproject.org/en-US/Fedora/18/html-single/UEFI_Secure_Boot_Guide/

The short story is that your BIOS only allows you to boot "secure" 
operating systems. Microsoft of course can sign their stuff and allow it 
to run in those machines. Fedora eventually got this to work - I don't 
remember the details now, but I don't have the ability to sign my 
kernels with the proper credentials. So you have to disable this in your 
BIOS.

This is all for "security"[*]
-- Fernando


[*] but I bet that eventually it will mean you will not be able to boot 
your own operating system on hardware you buy.