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Ctrl+Alt+L or "Lock" via the main menu does not lock the screen (nothing
visible happens).

The problem also occurred in 12.10 and persists after an upgrade to
13.04 (post Beta2).

Not sure if I should select the "This bug is a security vulnerability"
as the inability to lock the screen makes more difficult to leave the
computer unattended and not accessible to 3rd parties.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: lightdm 1.5.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-17.27-generic 3.8.6
Uname: Linux 3.8.0-17-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Wed Apr 10 11:15:09 2013
InstallationDate: Installed on 2013-02-13 (56 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
LightdmConfig:
 [SeatDefaults]
 user-session=ubuntu
 greeter-session=unity-greeter
MarkForUpload: True
SourcePackage: lightdm
UpgradeStatus: Upgraded to raring on 2013-04-09 (0 days ago)

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug raring
-- 
Lock screen does not work
https://bugs.launchpad.net/bugs/1167408
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