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I have a minimal install on my Pi Zero using DietPi.

I now want to add RealVNC to it so I have followed the instructions at their site: https://www.realvnc.com/docs/raspberry-pi.html

I installed it with sudo apt-get install realvnc-vnc-server

The I had to install some missing dependencies 

sudo apt-get install xauth x11-xserver-utils libgtk2.0-0

Now I get an error in the log:

Starting session: /etc/X11/Xsession
Session terminated with return code 1
FreeFontPath: FPE "/usr/share/vnc/fonts/" refcount is 2, should be 1; fixing.
<13> 2016-12-05T05:14:35.436Z DietPi Xvnc[2932]: ServerManager: Server stopped
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":1"
  after 78 requests (78 known processed) with 29 events remaining.
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  • Consult the DietPi ready-to-run applications using dietpi-software list. See the this forum post for reference. There is a RealVNC app, so you don't have to go the apt-get way. – jogco Dec 8 '16 at 8:28
  • 139 is not released yet. – opticyclic Dec 8 '16 at 14:42
  • Oops, missed that., sorry. But listed just above are some alternatives that are available. TightVNC Server, for example. – jogco Dec 9 '16 at 12:56
  • RealVNC is the only one that does Direct Capture – opticyclic Dec 9 '16 at 14:57
  • Ok, it says on the RealVNC page you referred to that for older or other distributions than raspbian you should install manually. If you installed with apt, you didn't go that route. – jogco Dec 11 '16 at 8:37
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It looks like it's installed ok if you're getting that far.

You're starting a virtual mode session but the Xsession script is failing to start a desktop environment, so it just shuts down immediately. By default it will run /etc/vnc/xstartup, which is supposed to start the default desktop environment and not return until the user logs off. You should make sure you have a suitable environment installed (e.g. LXDE).

Alternatively, you can run the RealVNC server in service mode, which lets you connect to the console display (i.e. what you see if you have a display plugged in). You can start this by starting/enabling the vncserver-x11-serviced service. This requires X11 to be running, unless you have enabled "experimental direct capture mode", in which case it can remote the text-mode console too - see this page for more details: https://www.realvnc.com/docs/raspberry-pi.html#running-directly-rendered-apps-such-as-minecraft-remotely

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