Comment 0 for bug 1310183

 I unintentionally changed permissions of the files in root directory. Hence I'm seeing login issues.

I'm Unable to login from 'ctrl+alt+l' or Screen lock after normal 'Power Save'. On entering the correct password the machine fails to unlock.
I Need to click 'Switch User' & then the screen takes to main login screen, where on entering the password, the login succeeds

lsb_release -rd
Description: Ubuntu 12.04.4 LTS
Release: 12.04

apt-cache policy
Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/ precise/main i386 Packages
     release v=12.04,o=LP-PPA-nilarimogard-webupd8,a=precise,n=precise,l=WebUpd8,c=main
     origin ppa.launchpad.net
 500 http://archive.canonical.com/ubuntu/ precise/partner i386 Packages
     release v=12.04,o=Canonical,a=precise,n=precise,l=Partner archive,c=partner
     origin archive.canonical.com
etc...

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-screensaver 3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-60.91-generic 3.2.55
Uname: Linux 3.2.0-60-generic i686
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
Date: Sun Apr 20 12:19:20 2014
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session idle-delay uint32 600
 org.gnome.desktop.session session-name 'ubuntu'
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
UpgradeStatus: No upgrade log present (probably fresh install)
WindowManager: No value set for `/desktop/gnome/session/required_components/windowmanager'