** Description changed:

- When I lock the screen I found that switching to console and then using 
ctrl+alt+F7 to switch back to GUI bypasses the lock screen without typing any 
password. even when I click on switch user after locking the screen if 
replicate the same process it takes me to the locked user account without 
prompting for password.
-  
+ When I lock the screen I found that switching to console and then using
+ ctrl+alt+F7 to switch back to GUI bypasses the lock screen without
+ typing any password. even when I click on switch user after locking the
+ screen if replicate the same process it takes me to the locked user
+ account without prompting for password.
+ 
+ steps to reproduce:
+ - Lock the screen either from the gui or even using a terminal command.
+ - switch to a tty i.e ctrl + alt + f4
+ - Switch back to gui ctrl + alt + F7
+ 
  ubuntu 15.10.
  unity desktop.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: lightdm 1.16.7-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar  3 07:19:08 2016
  InstallationDate: Installed on 2015-11-09 (114 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1552537

Title:
  Lock screen bypassed by switching to console and then back to GUI

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