@Jeff MAAS uses the same bits as what the ISO uses. What is different is
how local booting happens with MAAS vs with the ISO. When installed with
the ISO the local boot process is UEFI Firmware -> Shim(from disk) ->
GRUB(from disk) -> Boot local kernel. When installed with MAAS the local
boot process is UEFI Firmware -> Shim(from network) -> GRUB(from
network) -> Shim(from disk) -> Grub(from disk) -> Boot local kernel. The
chain of trust when switching going from GRUB(from network) to Shim(from
disk). I suspect but haven't verified that this may be due to the shim
not being signed with a key GRUB has.

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

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