(Ubuntu 16.04, non-UEFI) package shim-signed 1.12+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[prasanth]

it occured while reinstalling ubuntu

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.12+0.8-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Tue Feb 14 19:32:47 2017
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda1 68767248 4147436 61103500 7% /
 /dev/sdb1 7616752 1483920 6132832 20% /cdrom
 udev 4021788 0 4021788 0% /dev
 tmpfs 807288 9556 797732 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
 apt 1.2.10ubuntu1
SourcePackage: shim-signed
Title: package shim-signed 1.12+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)