This is still an issue on 16.04, but `lightdm` isn't restartable with
`sudo systemctl restart lightdm.service` from another `tty`.

** Tags added: xenial

** Description changed:

  The first invoking of `optirun bash` always makes `lightdm` crash
  (effect is the same as invoking `sudo systemctl restart lightdm.service`
  from another `tty`), all further invokations show
  
      [  235.554092] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) 
NOUVEAU(0): [drm] failed to set drm interface version.
      [  235.554195] [ERROR]Aborting because fallback start is disabled.
  
  `bumblebee` is configured to use the `nouveau` driver.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: bumblebee 3.2.1-9
  Uname: Linux 4.4.1-040401-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Feb 11 20:01:52 2016
  InstallationDate: Installed on 2013-10-17 (847 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: bumblebee
  UpgradeStatus: Upgraded to wily on 2015-11-19 (84 days ago)
  mtime.conffile..etc.bumblebee.bumblebee.conf: 2016-02-08T23:28:48.532707
  mtime.conffile..etc.bumblebee.xorg.conf.nouveau: 2016-02-08T23:16:11.143164
  mtime.conffile..etc.bumblebee.xorg.conf.nvidia: 2015-12-01T16:55:32.376129
  --- 
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  InstallationDate: Installed on 2013-10-17 (861 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  Package: bumblebee 3.2.1-9 [origin: unknown]
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 4.2.0-29.34-generic 4.2.8-ckt3
  Tags: third-party-packages wily
  Uname: Linux 4.2.0-29-generic x86_64
  UnreportableReason: Das ist kein offizielles Ubuntu-Paket. Bitte entfernen 
Sie alle Pakete von Drittanbietern und wiederholen Sie den Vorgang.
  UpgradeStatus: Upgraded to wily on 2015-11-19 (99 days ago)
  UserGroups: adm bumblebee cdrom dip lpadmin netdev plugdev sambashare sudo
  _MarkForUpload: True
  mtime.conffile..etc.bumblebee.bumblebee.conf: 2016-02-08T23:28:48.532707
  mtime.conffile..etc.bumblebee.xorg.conf.nouveau: 2016-02-08T23:16:11.143164
  mtime.conffile..etc.bumblebee.xorg.conf.nvidia: 2015-12-01T16:55:32.376129
+ --- 
+ ApportVersion: 2.20-0ubuntu3
+ Architecture: amd64
+ CurrentDesktop: Unity
+ DistroRelease: Ubuntu 16.04
+ InstallationDate: Installed on 2013-10-17 (871 days ago)
+ InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
+ NonfreeKernelModules: openafs
+ Package: bumblebee 3.2.1-10
+ PackageArchitecture: amd64
+ Tags:  xenial
+ Uname: Linux 4.4.3-040403-generic x86_64
+ UpgradeStatus: Upgraded to xenial on 2016-03-04 (1 days ago)
+ UserGroups: adm bumblebee cdrom dip fuse lpadmin netdev plugdev sambashare 
sudo
+ _MarkForUpload: True
+ mtime.conffile..etc.bumblebee.bumblebee.conf: 2016-02-08T23:28:48.532707
+ mtime.conffile..etc.bumblebee.xorg.conf.nouveau: 2016-03-04T22:45:30.292299
+ mtime.conffile..etc.bumblebee.xorg.conf.nvidia: 2015-12-01T16:55:32.376129

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https://bugs.launchpad.net/bugs/1544726

Title:
  optirun makes lightdm crash at first invokation

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