I have the same problem as the 2 on the bottom of this report. I found out that it might be gizmo issue.
$ grep -i Gizmo Log.txt
dlerror:/var/home/mirkoz/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/common/X-Plane 11/Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.
plugin.xpl: invalid ELF header
I tried to uninstall TBM and remove Gizmo plugin and ran the installer again. And the installed linux gizmo looks like broken:
$ file Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.plugin.xpl
Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.plugin.xpl: data
$ ldd Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.plugin.xpl
ldd: warning: you do not have execution permission for `Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.plugin.xpl'
not a dynamic executable
The windows plugin looks good:
$ file Resources/plugins/Gizmo64.plugin/win_x64/Gizmo64.plugin.xpl
Resources/plugins/Gizmo64.plugin/win_x64/Gizmo64.plugin.xpl: PE32+ executable (DLL) (console) x86-64, for MS Windows, 6 sections
and other plugins looks like this:
$ ldd Resources/plugins/AviTab/lin_x64/AviTab.xpl
ldd: warning: you do not have execution permission for `Resources/plugins/AviTab/lin_x64/AviTab.xpl'
linux-vdso.so.1 (0x00007f21b4532000)
libGL.so.1 => /lib64/libGL.so.1 (0x00007f21b44a4000)
libm.so.6 => /lib64/libm.so.6 (0x00007f21b43be000)
libmvec.so.1 => /lib64/libmvec.so.1 (0x00007f21b2f05000)
libc.so.6 => /lib64/libc.so.6 (0x00007f21b2d13000)
/lib64/ld-linux-x86-64.so.2 (0x00007f21b4534000)
libGLX.so.0 => /lib64/libGLX.so.0 (0x00007f21b438d000)
libX11.so.6 => /lib64/libX11.so.6 (0x00007f21b2bce000)
libXext.so.6 => /lib64/libXext.so.6 (0x00007f21b4377000)
libGLdispatch.so.0 => /lib64/libGLdispatch.so.0 (0x00007f21b42fe000)
libxcb.so.1 => /lib64/libxcb.so.1 (0x00007f21b2ba3000)
libXau.so.6 => /lib64/libXau.so.6 (0x00007f21b2b9d000)
Given that it does not ask for credentials when its run, I think it might be related to the described problems. I guess something has changed in gizmo as it used to work at least for my friend on Fedora Linux. As of now, the plane is somehow functional but unusable
dlerror:/home/davi-coutinho/snap/steam/common/.local/share/Steam/steamapps/common/X-Plane 11/Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.plugin.xpl: invalid ELF header
dlerror:/home/ssu/.local/share/Steam/steamapps/common/X-Plane 11/Resources/plugins/Gizmo64.plugin/lin_x64/Gizmo64.plugin.xpl: invalid ELF header
