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I have the same problem. I removed plugins from Resources/plugins except the plugins I thought are part of X-Plane 11. X-Plane still crashes.
Here is my log. It mentions second line from the bottom. "Loaded: /home/greg/X-Plane_11/Aircraft/Laminar Research/Boeing B737-800/plugins/xlua/64/lin.xpl (com.x-plane.xlua.1.0.0b1)" Then on next line crashed.
There is a lot of custom scenery in this log as well. Does removing that (and any other add ons) help? If the automatic crash reporter comes up, please be sure to send the report (a Windows only feature though).
The default files in the plug in folder are:
I removed all custom scenery, libraries and overlays. I also removed the CustomSBDatarefs004 folder so it looks similar to the image you posted. X-Plane 11.015pb still crashed but it took much longer, until I was nearly about to land at destination airport.
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