package libgbm1-lts-xenial 11.2.0-1ubuntu2~trusty1 failed to install/upgrade: subprocess new pre-installation script returned error exit status 2

[Balaji]

dpkg: warning: files list file for package 'libkfile4' missing; assuming package has no files currently installed
(Reading database ... 256821 files and directories currently installed.)
Preparing to unpack .../postgresql-9.3_9.3.17-1.pgdg14.04+1_amd64.deb ...
invoke-rc.d: unknown initscript, /etc/init.d/postgresql not found.
dpkg: warning: subprocess old pre-removal script returned error exit status 100
dpkg: trying script from the new package instead ...
invoke-rc.d: unknown initscript, /etc/init.d/postgresql not found.
dpkg: error processing archive /var/cache/apt/archives/postgresql-9.3_9.3.17-1.pgdg14.04+1_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 100
Errors were encountered while processing:
 /var/cache/apt/archives/postgresql-9.3_9.3.17-1.pgdg14.04+1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libgbm1-lts-xenial 11.2.0-1ubuntu2~trusty1
ProcVersionSignature: Ubuntu 4.4.0-45.66~14.04.1-lowlatency 4.4.21
Uname: Linux 4.4.0-45-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.24
Architecture: amd64
Date: Sat Jul 29 10:23:01 2017
DuplicateSignature: package:libgbm1-lts-xenial:11.2.0-1ubuntu2~trusty1:subprocess new pre-installation script returned error exit status 2
ErrorMessage: subprocess new pre-installation script returned error exit status 2
InstallationDate: Installed on 2017-01-17 (192 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.7
 apt 1.0.1ubuntu2.17
SourcePackage: mesa-lts-xenial
Title: package libgbm1-lts-xenial 11.2.0-1ubuntu2~trusty1 failed to install/upgrade: subprocess new pre-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)