Comment 13 for bug 1865515

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.

[1] https://git.launchpad.net/maas/tree/src/provisioningserver/templates/uefi/config.local.amd64.template