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[Kai Mast <mail@xxxxxxxxxxx>]

I had a similar issue. Did you have unity-system-compositor installed by
any chance? Removing it solved the problem for me.

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https://bugs.launchpad.net/bugs/1459043

Title:
  Attempting to lock screen sometimes kills whole session

Status in lightdm package in Ubuntu:
  New

Bug description:
  Attempting to lock screen sometimes kicks me to lightdm login screen
  (like I rebooted) insteading of locking the screen, that effectively
  kills active session because when I log in again I get an "empty"
  session, like I rebooted the system.

  lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 14.04.2 LTS
  Release:	14.04
  Codename:	trusty

  apt-cache policy lightdm
  lightdm:
    Installed: 1.10.5-0ubuntu1
    Candidate: 1.10.5-0ubuntu1
    Version table:
   *** 1.10.5-0ubuntu1 0
          500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.10.0-0ubuntu3 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  apt-cache policy unity
  unity:
    Installed: 7.2.4+14.04.20150316-0ubuntu1
    Candidate: 7.2.4+14.04.20150316-0ubuntu1
    Version table:
   *** 7.2.4+14.04.20150316-0ubuntu1 0
          500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       7.2.2+14.04.20140714-0ubuntu1.1 0
          500 http://archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
       7.2.0+14.04.20140416-0ubuntu1 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  uname -r
  3.16.0-38-generic

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lightdm 1.10.5-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10
  Uname: Linux 3.16.0-38-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed May 27 01:06:54 2015
  InstallationDate: Installed on 2015-05-17 (9 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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