This site is being deprecated.
Please see the official X‑Plane Support page for help.
I don't have a Linux system to check it out personally, but please file a bug here so someone can look into it further. Please be as specific as possible in the steps you take (i.e., download installer from x-plane.com, launch it, click continue, etc) and include a copy of your installer log.txt file (found on the desktop).
This site is no longer being actively maintained.