package libc-bin 2.23-0ubuntu7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

[atul vaish]

installing selinux led me to this and my 16.04 ubuntu during normal boot up lands at "low graphics mode" . now selinux has been removed, though I get this error and even "low graphics mode" issue not going away (as a workaround , boot up via grub-->recovery-->enable network stack-->do a normal resume, get me my system back) .

tried almost all methods to remove low graphics mode , but not success.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libc-bin 2.23-0ubuntu7
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
Uname: Linux 4.4.0-78-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
AptOrdering:
 libjasper1: Install
 selinux: Configure
 libjasper1: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Sat May 20 17:52:21 2017
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu7
 libgcc1 1:6.0.1-0ubuntu1
DuplicateSignature:
 package:libc-bin:2.23-0ubuntu7
 Processing triggers for libc-bin (2.23-0ubuntu7) ...
 dpkg (subprocess): unable to execute installed post-installation script (/var/lib/dpkg/info/libc-bin.postinst): Permission denied
 dpkg: error processing package libc-bin (--unpack):
  subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2017-02-28 (86 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: glibc
Title: package libc-bin 2.23-0ubuntu7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)