(Non uefi) package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

installation crashed almost at the end

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] File o directory non esistente: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.7-0ubuntu3
AptOrdering:
 shim:amd64: Install
 shim-signed:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Thu Oct 26 09:17:46 2017
Df:
 File system 1K-blocchi Usati Disponib. Uso% Montato su
 /dev/sda1 476561432 35204820 417125652 8% /
 /dev/sr0 1747952 1747952 0 100% /cdrom
 udev 1953416 0 1953416 0% /dev
 tmpfs 394236 11404 382832 3% /run
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
EFITables:

ErrorMessage: subprocess installed post-installation script returned error exit status 1
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
RelatedPackageVersions:
 dpkg 1.18.24ubuntu1
 apt 1.5
SourcePackage: shim-signed
Title: package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)