Cairo Dock runs at start up when logged back into Unity from Cairo Dock DE

[userDepth]

The Cairo dock Dock is leaving itself at start up because it cannot log out as it appears to be.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cairo-dock 3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-51.72-generic 4.4.30
Uname: Linux 4.4.0-51-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompositingMetacity: No value set for `/apps/metacity/general/compositing_manager'
CurrentDesktop: Unity
Date: Fri Dec 2 14:50:13 2016
InstallationDate: Installed on 2016-11-27 (5 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
PciDisplay: 00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 18) (prog-if 00 [VGA controller])
RelatedPackageVersions:
 xserver-xorg 1:7.7+13ubuntu3
 libgl1-mesa-glx 11.2.0-1ubuntu2.2
 libdrm2 2.4.67-1ubuntu0.16.04.2
 xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1.1
 xserver-xorg-video-ati 1:7.7.0-1
SourcePackage: cairo-dock
UpgradeStatus: No upgrade log present (probably fresh install)
WM: No value set for `/desktop/gnome/applications/window_manager/current'
glxinfo: Error: [Errno 2] No such file or directory: 'glxinfo'
system: distro = Ubuntu, architecture = x86_64, kernel = 4.4.0-51-generic