Re: efibootmgr help

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On Fri, Aug 28, 2015 at 4:10 AM, Paul Cartwright <pbcartwright@xxxxxxxxx> wrote:
> On 08/28/2015 04:22 AM, Tom H wrote:
>> On Thu, Aug 27, 2015 at 6:58 AM, Paul Cartwright <pbcartwright@xxxxxxxxx> wrote:
>>
>>
>> grub2-mkconfig works, but grub2-install /dev/sda gives me an error
>> grub2-install /dev/sda
>> grub2-install: error: /usr/lib/grub/x86_64-efi/modinfo.sh doesn't exist.
>> Please specify --target or --directory.
>> The message is clear. Use "grub2-install --target=x86_64-efi
>> --efi-directory=/boot/efi /dev/sda"
> I thought he said not to use grub2-install on UEFI systems..
>>
>> Boot001A* ubuntu
>> You've set Ubuntu to be the default efi binary.
>>
>> You'd have to run "efibootmgr -o 0002,..." to set Fedora as the default.
> and I did, and it works..
>>
>>
>>> is there a good manual somewhere for efibootmgr??
>> efibootmgr -h
> yeah, not a lot of help.. but this thread was:)
> efibootmgr -o xxxxx was the key...
>
>>
>>
>>> I thought when a new kernel was installed, grub would automagically add
>>> it... not with efi?
>> Because you're using Ubuntu's grub. So you'd have to boot into Ubuntu
>> and run "update-grub" in order to add the latest Fedora kernel to the
>> Ubuntu grub mennu.
> mmm in ubuntu I did grub-mkconfig & grub-install, but I didn't do the
> update-grub.. next time I boot ubuntu...

When UEFI Secure Boot is enabled, which it should be if available,
especially on a system with Window on it, you need the distro signed
shim.efi and grubx64.efi on the EFI system partition. If you use
grub-install the signed copy is wiped out, and the system won't boot
until you disable Secure Boot.

So in a UEFI Secure Boot world, grub-install (and grub2-install) is obsolete.

This bug is still annoying, and I wonder if it should be a blocker bug.
https://bugzilla.redhat.com/show_bug.cgi?id=1170245

-- 
Chris Murphy
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