Screen locking issue - password entered for re-login is showing invalid. but the same after clicking on switch-account works

[Saleem Ahmed Khan]

1) The release of Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04

2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
No idea which package

3) What you expected to happen
After screen timeout the screen gets locked. When valid password is entered for unlocking the screen it should have unlocked.

4) What happened instead
Instead invalid password message is displayed even though valid password is entered. But the same after clicking on switch-account works that is after clicking on switch-accounts all the accounts are listed and selecting the account that was locked and password is entered the screen unlocks.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-screensaver 3.6.1-0ubuntu13
Uname: Linux 3.14.1-031401-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.24
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Jun 10 15:17:45 2017
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session session-name 'ubuntu'
 org.gnome.desktop.session idle-delay uint32 600
InstallationDate: Installed on 2014-09-07 (1006 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: No upgrade log present (probably fresh install)