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[Launchpad Bug Tracker <1442611@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.17.0-0ubuntu1

---------------
lightdm (1.17.0-0ubuntu1) xenial; urgency=medium

  * New upstream release:
    - Disable log backups - this interferes with logrotate.
    - Support using libaudit to generate audit events.
    - Handle trailing whitespace on boolean values in configuration.
    - Update example configuration to more correctly match allowed options.
    - Fix unnecessary X server from being launched when locking seats.
    - Check the version of the X server we are running so we correctly pass
      -listen tcp when required.
    - Allow reading /proc/<PID>/net/dev from within a guest session.
      (LP: #1442609)
    - Allow guest sessions to write in /{,var/}run/screen folder.
      (LP: #1442611)
    - Update guest-session AppArmor profile to be suitable for openSUSE.
    - Fix apparmor profiles for running Chromium in guest sessions.
      (LP: #1504049, LP: #1464958)
    - Fix configure failing without Vala installed.
  * Build with multi-arch
  * debian/lightdm.logrotate:
    - Use logrotate to handle log files placed in the default system log
      directory (/var/log/lightdm).
  * debian/guest*:
    - Optimize guest account creation, use OverlayFS of AuFS if available.

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Wed, 28 Oct 2015
15:02:46 +1300

** Changed in: lightdm (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1442611

Title:
  Guest session can't write on /var/run/screen

Status in Light Display Manager:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released

Bug description:
  I'm customizing guest sessions in Xubuntu 15.04 in my school computer
  lab and dicovered that I'm unable to open user terminal in epoptes.
  The main reason for this problem is that epoptes uses screen for
  opening client terminals remotely on server session, but screen is
  currently unable to write on /var/run/screen for guest sessions.

  Could you please review current apparmor profile for lightdm-guest-
  session so it can get write access to /var/run/screen?

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