That is secure boot preventing you from booting an unsigned kernel. You
should be able to disable it in the BIOS though some don't label it as so
obviously.
On 8 Nov 2014 21:18, "Ian Park" <i.d.c.park@???> wrote:
> I recently bought a new PC from PC Specialist (the third one I've had from
> them - the laptop I'm using to compose this, and an "entry level" desktop
> for my wife). The new machine has an Asus Sabretooth motherboard with a
> UEFI BIOS.
>
> The first time I booted up the PC, I was too slow to hit the F2 key to go
> into the BIOS, and it booted into Windows (I'd specified that I wanted the
> machine with no OS, but I guess that PC Specialist installed Windows for
> the system test). I promptly did a restart, and this time caught it in time
> to hit F2 and go into the BIOS. I was able to change the boot order so that
> it booted from the Mint live DVD, stoked up gparted and re-arranged sda to
> have the partition layout I wanted (sda1 as 512MB for the EFI boot
> partition, sda2 & sda3 as 20GB partitions for root of Linux Mint and
> another OS to try out if I fancy it, sda4 as 20GB swap and sda5 as the
> remaining 160ish GB for the "visible" home partition to share between 2
> distros. I was then able to install Mint 17 on sda2.
>
> I then followed the tutorial in Linux Voice issue 2 to set up sda1 as the
> EFI boot partition and install the rEFInd boot manager. I hit a rock when I
> tried to boot from a USB stick with rEFInd on it, or a CD with rEFInd on
> it. The error message was: "The system found unauthorised changes on the
> firmware, operating system or UEFI drivers." I have a strong suspicion that
> this was an after-effect of the Windows installation which I deleted.
>
> Can anyone suggest a way of removing this Windows contamination, please?
>
> Thanks in advance
>
> Ian
> --
> Ian Park
> email: i.d.c.park@???
> --
>
>
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Please post to: Hampshire@???
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