[lubuntu-users] Starting lxsession in Xvnc4 displays

[Jeffrey Barish]

I use vncserver to start two Xvnc4 servers.  I want Lubuntu to run in those displays, so I 
added

exec /usr/bin/lxsession -s Lubuntu -e LXDE

to the last line of ~/.vnc/xstartup.  The problem is that the displays that appear always 
have a popup window initially with the message

GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already 
exists for the given subject

If I remove the line that runs lxsession, I don't get the popup (but I also don't get the 
Lubuntu desktop).

Is there a way to start a virtual desktop with Lubuntu without getting this message?

I am running Lubuntu 16.04.
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