(non-UEFI, Ubuntu-MATE 17.04) package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

error on Ubuntu MATE installation

ProblemType: Package
DistroRelease: Ubuntu 17.04
Package: shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
.proc.sys.kernel.moksbstate_disabled: 0
.sys.firmware.efi.efivars.MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23: Error: [Errno 2] No such file or directory: '/sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23'
.sys.firmware.efi.efivars.SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: Error: [Errno 2] No such file or directory: '/sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c'
ApportVersion: 2.20.4-0ubuntu4
AptOrdering:
 shim:amd64: Install
 shim-signed:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Thu Apr 20 18:20:24 2017
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda1 232139768 112863220 107461432 52% /
 /dev/sr0 1653168 1653168 0 100% /cdrom
 udev 3987448 0 3987448 0% /dev
 tmpfs 800788 9644 791144 2% /run
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
ErrorMessage: subprocess installed post-installation script returned error exit status 1
RelatedPackageVersions:
 dpkg 1.18.10ubuntu2
 apt 1.4
SourcePackage: shim-signed
Title: package shim-signed 1.28+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)