not able to lock my computer on Ubuntu 14.04

[Rohan Jaswal]

I am not able to lock my computer which gnome-screensaver is not working. I tried changing and reassigning the shortcuts using xscreensaver but that didn't work. the lock screen appears in a flash when i press Ctrl+Alt+L and then nothing happens. Please suggest some solution.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-screensaver 3.6.1-0ubuntu13
ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
Uname: Linux 3.13.0-36-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Sep 29 14:21:25 2014
GnomeSessionIdleInhibited: Yes
GnomeSessionInhibitors: 1: AppId = totem, Flags = 8, Reason = Playing a movie
GsettingsGnomeSession:
 org.gnome.desktop.session session-name 'ubuntu'
 org.gnome.desktop.session idle-delay uint32 300
InstallationDate: Installed on 2014-09-08 (20 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: gnome-screensaver
UpgradeStatus: No upgrade log present (probably fresh install)