(non-UEFI) package shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

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ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
.proc.sys.kernel.moksbstate_disabled: 0
.sys.firmware.efi.efivars.MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23: Error: [Errno 2] No existe el archivo o el directorio: '/sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23'
.sys.firmware.efi.efivars.SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: Error: [Errno 2] No existe el archivo o el directorio: '/sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c'
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Mon Jul 24 18:40:44 2017
Df:
 S.ficheros bloques de 1K Usados Disponibles Uso% Montado en
 /dev/sda5 95989516 4575860 86514536 6% /
 /dev/sdb1 7607008 1477008 6130000 20% /cdrom
 udev 4013376 0 4013376 0% /dev
 tmpfs 805604 9516 796088 2% /run
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: efibootmgr: EFI variables are not supported on this system.
ErrorMessage: subprocess installed post-installation script returned error exit status 1
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: shim-signed
Title: package shim-signed 1.28~16.04.1+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)