DUB saying my Linux exe file is "not an executable file" even though DUB built it

[WhatMeWorry via Digitalmars-d-learn]

On Sunday, 14 August 2016 at 01:05:33 UTC, Basile B. wrote:
> On Saturday, 13 August 2016 at 21:56:49 UTC, WhatMeWorry wrote:
>>
>> $ sudo chmod -v 777 *
>> mode of 'HelloWindow' changed from 0644 (rw-r--r--) to 0777 
>> (rwxrwxrwx)
>> $ ls -al
>> total 3016
>> drwxr-xr-x 2 generic generic    4096 Aug 13 16:48 .
>> drwxr-xr-x 7 generic generic    4096 Aug 12 23:14 ..
>> -rw-r--r-- 1 generic generic 3080080 Aug 13 16:48 HelloWindow
>>
>>
>> Now I'm really gobsmacked.
>
> Can you post the result of
>
>> $file HelloWindow
>
> ?

Certainly.

$file *
HelloWindow: ELF 32-bit LSB executable, Intel 80386, version 1 
(SYSV), dynamically linked, interpreter /lib/ld-linux.so.2, for 
GNU/Linux 2.6.32, 
BuildID[sha1]=1ee19ed1fe36d068ad24f1a16f9990b6b7ff4438, not 
stripped


I'm running Ubuntu (actually Xubuntu) 16.04.1 LTS  And I've got 
the very latest dmd and dub general releases.

I might be doing something unusual that may not even be allowed. 
I've got a USB flash drive that I'm trying to share between two 
physical machines: one Windows and the other Linux.  The dub 
project, bin, source code etc. is on the flash drive.
I compiled my little HelloWorld in dub to create a HelloWorld.exe 
on my Windows machine.  This compiled and ran fine.  I then moved 
the USB flash drive over to the Linux machine and reran dub 
build/run to create the executable HelloWorld that is now causing 
the trouble.  Should I not be trying to share a flash drive like 
this?