Comment 33 for bug 1711203

From Andres, the grub.cfg used for chainloading to local disk is:

set default="0"
set timeout=0

menuentry 'Local' {
    echo 'Booting local disk...'
    search --set=root --file /efi/ubuntu/shimx64.efi
    chainloader /efi/ubuntu/shimx64.efi
}

It should be possible to recreate an environment outside of maas for reproducing this (UEFI VM configured with SB on, netboot w/ shim+grub, chainload to disk via the above .cfg).