For me I can give some context:
- DELL XPS 9370
- Installed 18.04, dual boot, part of which I think meant that I needed secure 
boot (may be wrong)
- Attempted to upgrade Kernel to fix some bluetooth issues (known bugs) using 
UKUU
- Kernel install went OK, grub updated, but then on reboot the system complains 
that the kernel is not signed
- Attempted upgrade to 18.10, failed on same issue to new kernel not being 
signed
- But rebooted and checked kernel and it had updated OK to 4.18...
Thanks all I know... hope it helps.

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https://bugs.launchpad.net/bugs/1816249

Title:
  package grub-efi-amd64-signed 1.110.2+2.02+dfsg1-5ubuntu8.2 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

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