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Hi! Out of curiosity, how did you generate the esp?
Normally Ironic will build a grub.cfg file and include it into the
iso, then it is loaded automatically (providing the grub_config_path
is properly set) so you don't have anything to type by hand... That
grub.cfg default template uses "linuxefi" and "initrdefi" (instead of
linux/initrd you are using) which seem correct for most distributions
(but depending on the way you built the esp, if you used grub from
sources for example, linux/initrd would still be the right commands).
Maybe you can try the "efi" variants.

Best of luck!
Francois (frigo)


On Tue, 11 May 2021 at 20:45, Vuk Gojnic <vuk.gojnic at gmail.com> wrote:
>
> Hi Julia, thanks for the response.
>
> I have now verified that the server has Secure Boot set to Disabled.
> It happens on all our HPE Gen10 and Gen10+ servers that are booting
> with UEFI in the same configuration (Secure Boot Disabled).
>
> Unsigned initrd from ubuntu for example works with Kernel from IPA:
>
> I have also updated firmware of the server to the latest version, but
> it is still the same.
>
> I am going to try to drill deeper in IPA builder code and IPA initrd
> which seems not to go well with UEFI boot mode.
>
> I am grateful for any hint.
>
> Bests,
> Vuk
>