When trying to circumvent the lock on gnome with lightdm, it seems that
the exploit only works when using gnome on X. The exploit does not seem
to work when using gnome on wayland with lightdm.

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

Title:
  Lock can be circumvented by switching to console

Status in LXDE:
  New
Status in lightdm package in Ubuntu:
  New
Status in lxsession package in Ubuntu:
  Fix Released

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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