Yesterday we received multiple reports that the Aerosoft X-Plane 11 DVD set does not work with Linux. It turns out that there's something strange about how the DVDs are authored that makes the file names on Linux go all lower-case, which causes both the simulator and the installer to not be able to use the DVDs.
We have fixes for these problems that will be rolled into a new installer and the next update of X-Plane; in the meantime you can get them here for Linux now:
To install from the DVD, download this installer, run it, and insert your DVD, this installer from the net will install the contents of the DVDs normally.
Once you have installed X-Plane, replace your normal X-Plane-x86_64 app with the one attached here (placing the new app in your "X-Plane" folder) to run using the DVD to get out of demo mode.
You can use these two apps until we issue replacements; 11.01 should go beta early next week and contain "official" versions of these fixes, at which point you can just use the official version.
(Thanks to Daniel for his patience and helpfulness in trouble-shooting this remotely!)