According to this thread: http://askubuntu.com/questions/459840/lock-screen-not-working-14-04
this problem is likely due to a bug in gnome-screensaver, in that the 14.04 package does not configure it to run at startup. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/1511987 Title: Screen never locks when inactive Status in gnome-screensaver package in Ubuntu: New Bug description: The "Brightness & Lock" dialog reports that my screen should turn off when inactive for 5 minutes, and it should require my password to unlock, but this never happens. On a fresh install of 14.04, I've left it idle for over an hour and the desktop remains visible and unlocked. If I press ctrl+alt+l, the screen locks, however, I would expect this to happen automatically according to the "Brightness & Lock" dialog. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: gnome-screensaver 3.6.1-0ubuntu13 ProcVersionSignature: Ubuntu 3.19.0-31.36~14.04.1-generic 3.19.8-ckt7 Uname: Linux 3.19.0-31-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.16 Architecture: amd64 CurrentDesktop: GNOME Date: Sat Oct 31 14:15:13 2015 GnomeSessionIdleInhibited: No GnomeSessionInhibitors: 1: AppId = gedit, Flags = 1, Reason = There are unsaved documents GsettingsGnomeSession: org.gnome.desktop.session session-name 'ubuntu' org.gnome.desktop.session idle-delay uint32 300 InstallationDate: Installed on 2015-10-20 (10 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) SourcePackage: gnome-screensaver UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1511987/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
