This bug was fixed in the package dbus - 1.6.18-0ubuntu8
--------------- dbus (1.6.18-0ubuntu8) utopic; urgency=medium
* debian/dbus-Xsession: Don't start a session bus if there already is one, i. e. $DBUS_SESSION_BUS_ADDRESS is already set. (Closes: #681241) -- Martin Pitt <email address hidden> Tue, 03 Jun 2014 11:07:54 +0200
This bug was fixed in the package dbus - 1.6.18-0ubuntu8
---------------
dbus (1.6.18-0ubuntu8) utopic; urgency=medium
* debian/ dbus-Xsession: Don't start a session bus if there already is one, BUS_ADDRESS is already set. (Closes: #681241)
i. e. $DBUS_SESSION_
-- Martin Pitt <email address hidden> Tue, 03 Jun 2014 11:07:54 +0200