log flooded with gnome-session not authorized

[svenmeier]

Syslog on my system is flooded with authorization warnings every second:

Jul 30 09:17:17 svenBlack gnome-session[3093]: Error executing command as another user: Not authorized
Jul 30 09:17:17 svenBlack gnome-session[3093]: This incident has been reported.

No further information is given on what command resulted in an error.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-session 3.18.1.2-1ubuntu1.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Jul 30 09:17:19 2016
InstallationDate: Installed on 2015-04-27 (459 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: gnome-session
UpgradeStatus: Upgraded to xenial on 2016-04-16 (104 days ago)

[Marshal Linfoot (mlinfoot)]

I'm seeing the identical situation - /var/log/syslog flooded with gnome-session error messages.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.