Comment 25 for bug 1711203

I've tried this and the problem persists. Note that MAAS *IS* installing the signed kernel, which is necessary but insufficient for a fix; the problem seems to be that Shim/GRUB is becoming confused by the handoff from the PXE-boot version of GRUB to the GRUB stored on the hard disk. If my analysis is correct, this will require either:

* Changes to Shim/GRUB so that it works in this configuration. This used to
  be the case, but the Shim/GRUB configuration has been tightening
  security, which introduced this bug as a side effect.
* A change in the way MAAS/curtin configures the PXE-booted GRUB so that it
  boots the system directly, without chainloading to GRUB on the hard disk.
  Note that this approach to a solution used to be used on ARM64 EFI
  systems, but that created a (now-fixed) bug #1582070. Thus, if this
  approach is used, care will have to be taken to not cause a regression on
  that bug.