package shim-signed 1.12+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Installing ubuntu mate 16.04 on top of ubuntu 14.04 in a new partition until "boot" grub2 failed

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.12+0.8-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Fri May 20 17:41:21 2016
Df:
 Filesystem 1K-blocks Used Available Use% Mounted on
 /dev/sda5 947399924 15906984 883344716 2% /
 /dev/sdb1 62382304 6534704 55847600 11% /cdrom
 udev 1726844 0 1726844 0% /dev
 tmpfs 348276 10104 338172 3% /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)