MAAS doesn't know for sure what operating system is deployed locally.
When booting locally MAAS sends a grub.cfg[1] which searches for the
shim or local bootloader. MAAS first tries \efi\boot\bootx64.efi as that
is the default location as per the UEFI spec. Most operating systems
including Ubuntu put a bootloader there. The shim fails to find grub as
Ubuntu only stores grub in \efi\ubuntu\grubx64.efi. The two failure
messages are from that. The config then tries to load
\efi\ubuntu\shimx64.efi which succeeds but is unable to verify either
\efi\ubuntu\shimx64.efi or \efi\ubuntu\grubx64.efi.


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  Chainbooting from grub over the network to local shim breaks chain of

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