Warning: Error in .External2: unable to start device PNG

[jcblum]

This looks like the same thing being reported over here:

Shiny-server on ubuntu 16 error: "unable to open connection to X11 display ''

... I'm trying to run a shiny dashboard on an Ubuntu 16 aws ec2 and the sample is partially working: it shows the dashboard controls but and error message instead of the graphs. Error log out put at /var/log/shinyserver: Listening on http://127.0.0.1:35434 Warning in pngfun(filename = filename, width = width, height = height, res = res, : unable to open connection to X11 display '' Warning: Error in .External2: unable to start device PNG 123: pngfun 122: startPNG 121: drawPlot 107: <reactive:plotObj> 91: drawReactive 78: origRenderFunc 77: output$distPlot 1: runApp From shiny-server.conf at /etc/shiny-server: # Instruct Shiny Server to run applications as the use…

I’m afraid troubleshooting hasn’t gotten very far yet, though.