@ibere-fernandes
It does not work, if gnome-screensaver is running.

@gilir
What is a SRU update? The proposed fix in the PPA does not give user any other 
option than to use xscreensaver, but still keeps the options hanging there in 
lxlock script. If the options are wanted to be preserved, xscreensaver or 
whichever screen saver/locker is installed as a dependency of the desktop 
environment, should be used as fallback. Using "xdg-screensaver lock" as the 
fallback is insane, if there is a possibility, that it calls lxlock, like a 
comment in the script suggests, since there may be endless loop then.
Therefore, something like the attachment should be used. (I dropped xlock as an 
option, because it is not available for Ubuntu anymore.)

** Attachment added: "lxlock script that falls back to xscreensaver, if other 
options are not available"
   
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1205384/+attachment/3913256/+files/lxlock

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https://bugs.launchpad.net/bugs/1205384

Title:
  Lock can be circumvented by switching to console

Status in LXDE - Lightweight X11 Desktop Environment:
  New
Status in “lightdm” package in Ubuntu:
  Invalid
Status in “lxsession” package in Ubuntu:
  In Progress

Bug description:
  Steps to reproduce:
  1)lock your screen using "dm-tool switch-to-greeter" or "dm-tool lock"
  2)switch to console via ctrl+alt+F1
  3)switch back to X via ctrl+alt+F7
  Result: session is unlocked without entering a password

  Expected behaviour:
  session should still be locked when switching back to X

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: lightdm 1.7.7-0ubuntu2
  ProcVersionSignature: Ubuntu 3.10.0-5.15-generic 3.10.2
  Uname: Linux 3.10.0-5-generic i686
  ApportVersion: 2.11-0ubuntu1
  Architecture: i386
  Date: Fri Jul 26 17:30:23 2013
  InstallationDate: Installed on 2013-07-26 (0 days ago)
  InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130723.1)
  MarkForUpload: True
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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