Public bug reported:

Installing grub to /boot/efi.
Installing for x86_64-efi platform.
grub-install: warning: Internal error.
grub-install: error: failed to register the EFI boot entry: Operation not 
permitted.
NTFS signature is missing.
Failed to mount '/dev/sdb': Invalid argument
The device '/dev/sdb' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
dpkg: error processing package shim-signed (--configure):
 installed shim-signed package post-installation script subprocess returned 
error exit status 12
Errors were encountered while processing:
 shim-signed

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: shim-signed 1.40.4+15+1552672080.a4a1fbe-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
Uname: Linux 4.15.0-124-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or 
directory: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
BootEFIContents:
 BOOTX64.CSV
 grub.cfg
 grubx64.efi
 mmx64.efi
 shimx64.efi
CasperMD5CheckResult: skip
Date: Sun Nov 22 20:34:57 2020
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI 
variables are not supported on this system.
EFITables:
 
ErrorMessage: installed shim-signed package post-installation script subprocess 
returned error exit status 12
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 
3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt  2.0.2ubuntu0.1
SourcePackage: shim-signed
Title: package shim-signed 1.40.4+15+1552672080.a4a1fbe-0ubuntu2 failed to 
install/upgrade: installed shim-signed package post-installation script 
subprocess returned error exit status 12
UpgradeStatus: Upgraded to focal on 2020-11-22 (0 days ago)

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package focal uec-images

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https://bugs.launchpad.net/bugs/1905198

Title:
  package shim-signed 1.40.4+15+1552672080.a4a1fbe-0ubuntu2 failed to
  install/upgrade: installed shim-signed package post-installation
  script subprocess returned error exit status 12

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