package grub-pc 2.02~beta2-36ubuntu3.9 failed to install/upgrade: package grub-pc is already installed and configured

after installing a new 480Gig ssd installing first win7 ultimate then ubuntu16.04 there was no mbr. to start ubuntu i needed to use grub2 disk. no make shift!!!!!!! so i started bootrepair, since, there is no update or software installation possible!

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-pc 2.02~beta2-36ubuntu3.9
ProcVersionSignature: Ubuntu 4.4.0-77.98-generic 4.4.59
Uname: Linux 4.4.0-77-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
CrashReports:
 600:109:116:0:2017-05-05 20:48:41.276984479 +0200:2017-05-05 20:48:41.276984479 +0200:/var/crash/_usr_bin_update-manager.1000.uploaded
 600:0:116:516292:2017-05-06 15:04:01.010122060 +0200:2017-05-06 15:04:02.010122060 +0200:/var/crash/grub-pc.0.crash
 640:1000:116:602640:2017-05-05 20:48:30.747754096 +0200:2017-05-05 20:48:31.747754096 +0200:/var/crash/_usr_bin_update-manager.1000.crash
 664:1000:116:0:2017-05-05 20:48:31.751754490 +0200:2017-05-05 20:48:31.751754490 +0200:/var/crash/_usr_bin_update-manager.1000.upload
Date: Sat May 6 15:04:01 2017
DuplicateSignature:
 package:grub-pc:2.02~beta2-36ubuntu3.9
 Processing triggers for mime-support (3.59ubuntu1) ...
 dpkg: error processing package grub-pc (--configure):
  package grub-pc is already installed and configured
ErrorMessage: package grub-pc is already installed and configured
InstallationDate: Installed on 2017-05-05 (1 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-77-generic root=UUID=6007aa74-e584-46a3-9070-30c726eaeac1 ro quiet splash
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: dpkg
Title: package grub-pc 2.02~beta2-36ubuntu3.9 failed to install/upgrade: package grub-pc is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)