I found exactly same problem and some answer on this question:

https://askubuntu.com/questions/646631/emacs-doesnot-work-with-xdg-open

But I hope Org Mode can provide solution by default. Based on the description in
answers. Is there something Org Mode can do to get around this problem?

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Hello,
>
> stardiviner <numbchild@gmail.com> writes:
>
>> When I press =[C-u C-u C-c C-o]= to open an image file link with system external
>> program. It can't open the image file.
>
> Is it really an Org bug? I.e., is your mailcap file properly set up?
>
> If you think this is really an Org bug, could you provide an ECM,
> including your .mailcap?
>
> Regards,


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