@Larry: Are you able to provide a console log using Ryan's debug curtin package?
I wonder if GRUB is getting upgraded post-install, thus causing a second grub-install command to run in the postinst. This is a known issue w/ MAAS on EFI systems - though it usually only bites when you upgrade GRUB after deploy. I haven't seen it occur *during* deploy. If this is the case, a patch like the following would allow curtin to preseed GRUB to not make changes to the EFI boot manager during upgrades.
@Larry: Are you able to provide a console log using Ryan's debug curtin package?
I wonder if GRUB is getting upgraded post-install, thus causing a second grub-install command to run in the postinst. This is a known issue w/ MAAS on EFI systems - though it usually only bites when you upgrade GRUB after deploy. I haven't seen it occur *during* deploy. If this is the case, a patch like the following would allow curtin to preseed GRUB to not make changes to the EFI boot manager during upgrades.