For me, the 4x EFI partitions were placed into 0.90 mode RAID to ease the data 
synchronization.
`fdisk -l` clearly shows them as EFI
For some reason, GRUB didn't see them as 'EFI System', but as 'Linux raid'.
I've had to manually wipe the superblocks and run `dpkg-reconfigure -plow 
grub-efi-amd64-signed` to kick it to senses.

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https://bugs.launchpad.net/bugs/2114715

Title:
  package grub-efi-amd64-signed 1.187.12+2.06-2ubuntu14.8 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 32

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