[Bug 1815137] [NEW] Update to 2.02ubuntu8.11 fails.

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Public bug reported:

Today running an apt dist-upgrade i was prompted with this error:

Setting up grub-efi-amd64 (2.02-2ubuntu8.11) ...
/var/lib/dpkg/info/grub-efi-amd64.postinst: line 324: /usr/share/grub/grub-check-signatures: Permission denied
dpkg: error processing package grub-efi-amd64 (--configure):
 installed grub-efi-amd64 package post-installation script subprocess returned error exit status 126
Errors were encountered while processing:
 grub-efi-amd64
E: Sub-process /usr/bin/dpkg returned an error code (1)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1815137

Title:
  Update to 2.02ubuntu8.11 fails.

Status in grub2 package in Ubuntu:
  New

Bug description:
  Today running an apt dist-upgrade i was prompted with this error:

  Setting up grub-efi-amd64 (2.02-2ubuntu8.11) ...
  /var/lib/dpkg/info/grub-efi-amd64.postinst: line 324: /usr/share/grub/grub-check-signatures: Permission denied
  dpkg: error processing package grub-efi-amd64 (--configure):
   installed grub-efi-amd64 package post-installation script subprocess returned error exit status 126
  Errors were encountered while processing:
   grub-efi-amd64
  E: Sub-process /usr/bin/dpkg returned an error code (1)

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