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VNC GDBus Error

To fix the "GDBus Error:org freedesktop.PolicyKit1 Error.Failed; An Authentication agent already exists for the given subject" error do either of the following:-

1. 1. Run lxsession-edit as root from a terminal window within the VNC session.
   2. Remove the tick from LXPolKit and save.

or if that option is not available then cancel and:-

2. 1. Run sudo nano /etc/xdg/autostart/lxpolkit.desktop from a terminal window.
   2. Change the line that says Hidden=true to Hidden=false and save the file
   3. Run lxsession-edit from a terminal window within the VNC session.
   4. Remove the tick from LXPolKit and save.

   and reboot the Pi.